[FIR-TEST] Update testdata of old frontend tests

compiler/testData/diagnostics/tests/smartCasts/variables/ifVarIsChanged.fir.kt

@@ -6,6 +6,6 @@ public fun foo() {
     var s: Any = "not null"
     if (s is String) {
         s = 42
-        bar(s)
+        <!INAPPLICABLE_CANDIDATE!>bar<!>(s)
     }
 }

compiler/testData/diagnostics/tests/smartCasts/variables/whileWithBreak.fir.kt

@@ -13,5 +13,5 @@ fun list(start: String) {
         e = e.next()
     }
     // e can never be null but we do not know it
-    e.hashCode()
+    e.<!INAPPLICABLE_CANDIDATE!>hashCode<!>()
 }