Update grammar files to jlelong/vscode-latex-basics@8624d0b

Author: jlelong

syntax/TeX.tmLanguage.json

@@ -2,22 +2,22 @@
     "name": "TeX",
     "patterns": [
         {
-            "begin": "(\\\\)iffalse",
+            "begin": "(?<=^\\s*)((\\\\)iffalse)",
             "beginCaptures": {
-                "0": {
+                "1": {
                     "name": "keyword.control.tex"
                 },
-                "1": {
+                "2": {
                     "name": "punctuation.definition.keyword.tex"
                 }
             },
             "contentName": "comment.line.percentage.tex",
-            "end": "(\\\\)(else|fi)",
+            "end": "(?<=^\\s*)((\\\\)(?:else|fi))",
             "endCaptures": {
-                "0": {
+                "1": {
                     "name": "keyword.control.tex"
                 },
-                "1": {
+                "2": {
                     "name": "punctuation.definition.keyword.tex"
                 }
             },
@@ -167,8 +167,8 @@
             ]
         },
         "conditionals": {
-            "begin": "\\\\(if[a-z]*)",
-            "end": "\\\\fi",
+            "begin": "(?<=^\\s*)\\\\if[a-z]*",
+            "end": "(?<=^\\s*)\\\\fi",
             "patterns": [
                 {
                     "include": "#comment"