Adjust testData to CharSequence.length transformation

compiler/testData/diagnostics/tests/smartCasts/loops/ifBreakExprInsideWhileTrue.kt

@@ -3,8 +3,8 @@ public fun foo(x: String?): Int {
         // After the check, smart cast should work
         val y = if (x == null) break else <!DEBUG_INFO_SMARTCAST!>x<!>
         // y is not null in both branches
-        y.length()
+        y.length
     }
     // x is null because of the break
-    return x<!UNSAFE_CALL!>.<!>length()
+    return x<!UNSAFE_CALL!>.<!>length
 }