Cleanup deprecated symbol usages in testData

idea/testData/resolve/partialBodyResolve/As.completion

@@ -6,14 +6,14 @@ fun foo(p: Any, p1: Any?) {
     /* STATEMENT DELETED: z(f() as String) */
 
     if (a) {
-        print((p as String).length())
+        print((p as String).length)
     }
     else {
         print((p as String).get(1))
     }
 
     if (y()) {
-        print(<caret>p.charAt(1))
+        print(<caret>p[1])
         /* STATEMENT DELETED: p1 as String */
     }