refactor(material/icon): removes important and inline styles

Updates previous fix to remove the inline targets and the usage
of forced usage of styles as it is on the app to remove any
overriding styles.

Fixes b/250063405

BREAKING CHANGE: removes use of forced styles

Updates the previous fix which uses "important" and removes it
as any overrides should be fixed by the app mat-icon is used in
instead.

src/material/icon/icon.scss

@@ -74,11 +74,10 @@ mat-icon {
 .mat-mdc-form-field .mat-icon,
 .mat-grid-tile .mat-icon,
 .mat-mdc-list-item .mat-icon,
-.mat-mdc-list-option .mat-icon,
-.mat-icon:has(div[style*='letter-spacing:']):has(div[style*='word-spacing:']) {
+.mat-mdc-list-option .mat-icon {
   overflow: visible;
   // Apply styles to avoid text spacing
-  letter-spacing: 0 !important;
-  word-spacing: 0 !important;
-  line-height: 1 !important;
+  letter-spacing: 0;
+  word-spacing: 0;
+  line-height: 1;
 }