refactor(grids): change cell merging samples grid height (#1071)

Author: IMinchev64

samples/grids/hierarchical-grid/cell-merge-custom-sample/index.html

@@ -16,7 +16,7 @@
         <div id="root">
             <div class="container sample ig-typography">
                 <div class="container fill">
-                    <igc-hierarchical-grid id="grid" auto-generate="false" moving="true" allow-filtering="true" cell-merge-mode="always" width="100%" height="740px">
+                    <igc-hierarchical-grid id="grid" auto-generate="false" moving="true" allow-filtering="true" cell-merge-mode="always" width="100%" height="400px">
                         <igc-column field="CompanyName" sortable="true" resizable="true" editable="true"></igc-column>
                         <igc-column field="ContactName" sortable="true" resizable="true" editable="true"></igc-column>
                         <igc-column field="ContactTitle" sortable="true" resizable="true" merge="true" editable="true"></igc-column>

samples/grids/hierarchical-grid/cell-merge/index.html

@@ -16,7 +16,7 @@
         <div id="root">
             <div class="container sample ig-typography">
                 <div class="container fill">
-                    <igc-hierarchical-grid id="grid" auto-generate="false" primary-key="ID" moving="true" allow-filtering="true" cell-merge-mode="always" width="100%" height="740px">
+                    <igc-hierarchical-grid id="grid" auto-generate="false" primary-key="ID" moving="true" allow-filtering="true" cell-merge-mode="always" width="100%" height="450px">
                         <igc-grid-toolbar>
                             <igc-select id="mergeSelectRoot" value="always">
                                 <igc-select-header>Select Merge Type Root</igc-select-header>

samples/grids/tree-grid/cell-merge-custom-sample/index.html

@@ -16,8 +16,7 @@
         <div id="root">
             <div class="container sample ig-typography">
                 <div class="container fill">
-                    <igc-tree-grid id="treeGrid" auto-generate="false" primary-key="ID" foreign-key="ParentID" width="100%" height="800px" cell-merge-mode="always">
-                        <igc-grid-toolbar></igc-grid-toolbar>
+                    <igc-tree-grid id="treeGrid" auto-generate="false" primary-key="ID" foreign-key="ParentID" width="100%" height="720px" cell-merge-mode="always">
 
                         <igc-column field="Name" data-type="string" width="250px" editable="true"></igc-column>
                         <igc-column field="Title" data-type="string" width="250px" merge="true" editable="true" sortable="true"></igc-column>

samples/grids/tree-grid/cell-merge/index.html

@@ -16,7 +16,7 @@
         <div id="root">
             <div class="container sample ig-typography">
                 <div class="container fill">
-                    <igc-tree-grid id="treeGrid" auto-generate="false" primary-key="ID" foreign-key="ParentID" width="100%" height="800px" cell-merge-mode="always">
+                    <igc-tree-grid id="treeGrid" auto-generate="false" primary-key="ID" foreign-key="ParentID" width="100%" height="720px" cell-merge-mode="always">
                         <igc-grid-toolbar>
                             <igc-select id="mergeModeSelect" value="always">
                                 <igc-select-header>Select Merge Mode</igc-select-header>