fix tsserver picking hidden files created by emacs

Saw this good for first timers. I followed what @sheetalkamat suggested. 
#31916

src/compiler/sys.ts

@@ -330,7 +330,7 @@ namespace ts {
     }
 
     /*@internal*/
-    export const ignoredPaths = ["/node_modules/.", "/.git"];
+    export const ignoredPaths = ["/node_modules/.", "/.git", "/.#"];
 
     /*@internal*/
     export interface RecursiveDirectoryWatcherHost {