Removed probably-unnecessary statement from test.

Author: DanielRosenwasser

tests/cases/fourslash/assertContextualType.ts

@@ -2,8 +2,5 @@
 
 ////<(aa: number) =>void >(function myFn(b/**/b) { });
 
-// this line triggers a semantic/syntactic error check, remove line when 788570 is fixed
-edit.insert('');
-
 goTo.marker();
 verify.quickInfoIs('(parameter) bb: number');