Reduce highlighting range for UNCHECKED_CAST

#KT-18985 Fixed

compiler/testData/diagnostics/tests/regressions/kt307.kt

@@ -5,7 +5,7 @@ open class AL {
 }
 
 interface ALE<T> : <!INTERFACE_WITH_SUPERCLASS!>AL<!> {
-fun getOrNull(index: Int, value: T) : T {
-return <!UNCHECKED_CAST!>get(index) as? T<!> ?: value
-}
+    fun getOrNull(index: Int, value: T) : T {
+        return get(index) <!UNCHECKED_CAST!>as? T<!> ?: value
+    }
 }