rename tests

Author: aozgaa

tests/cases/fourslash/unusedImports2FS.ts

@@ -16,4 +16,4 @@
 ////
 //// }
 
-verify.rangeAfterCodeFix(`import {Calculator} from "./file1"`, /*includeWhiteSpace*/ true, /*errorCode*/ 0);
+verify.rangeAfterCodeFix(`import {Calculator} from "./file1"`, /*includeWhiteSpace*/ true, /*errorCode*/ undefined);

tests/cases/fourslash/unusedVariableInForLoop5FS.ts renamed to tests/cases/fourslash/unusedVariableInForLoop5FSAddUnderscore.ts

@@ -13,4 +13,4 @@ verify.rangeAfterCodeFix(`{
     for (const elem of ["a", "b", "c"]) {
         elem;
     }
-}`);
+}`, /*includeWhiteSpace*/ true);