Restore UNUSED_* diagnostics to relevant tests.

compiler/testData/diagnostics/tests/shadowing/ShadowParameterInNestedBlockInFor.fir.kt

@@ -1,7 +1,8 @@
+// !DIAGNOSTICS: +UNUSED_PARAMETER +UNUSED_LAMBDA_EXPRESSION +UNUSED_VARIABLE
 fun f(i: Int) {
     for (j in 1..100) {
         {
             var i = 12
         }
     }
-}
+}