fix: bottom panel resizer appearing over the open git remotes dropdown

Author: devvaannsh

src/extensions/default/Git/styles/git-styles.less

@@ -1,4 +1,5 @@
 @import "../../../../styles/brackets_core_ui_variables.less";
+@import (reference) "../../../../styles/brackets_variables.less";
 
 // common
 @git-moreDarkGrey:               #868888;
@@ -1146,6 +1147,9 @@
             color: @dark-bc-text;
         }
     }
+    .mainToolbar:has(.btn-group.open) {
+        z-index: (@z-index-brackets-panel-resizer + 1);
+    }
     .git-remotes {
         border-radius: 4px 0 0 4px;
         display: inline-flex;