Update fortran_free-form.tmLanguage.json for labeled "if" and "where" statements

Some correct syntax of labeled "if" and "where" statements messed up the syntax highlighting. This commit fixes those issues.

Author: wilsong-anl

syntaxes/fortran_free-form.tmLanguage.json

@@ -1642,11 +1642,11 @@
                     {
                       "comment": "rest of else line",
                       "begin": "(?!(\\s*(;|!|\\n)))",
-                      "end": "(?=[;!\\n])",
+                      "end": "\\s*(?=[;!\\n])",
                       "patterns": [
                         {
                           "comment": "capture the label if present",
-                          "match": "\\s*([a-z]\\w*)?\\s*\\b(\\w*)\\b",
+                          "match": "(?i)\\s*([a-z]\\w*)?\\s*\\b(\\w*)\\b",
                           "captures": {
                             "1": {
                               "name": "meta.label.else.fortran"
@@ -1882,11 +1882,20 @@
                       "name": "keyword.control.elsewhere.fortran"
                     }
                   },
-                  "end": "(?=[;!\\n])",
+                  "end": "\\s*(?=[;!\\n])",
                   "patterns": [
                     {
                       "include": "#parentheses"
                     },
+                    {
+                      "comment": "capture the label if present",
+                      "match": "(?i)(\\s*[a-z]\\w*)?",
+                      "captures": {
+                        "1": {
+                          "name": "meta.label.elsewhere.fortran"
+                        }
+                      }
+                    },
                     {
                       "include": "#invalid-word"
                     }