Fix false warning about useless cast in property and property accessor

Note that there are some other problems, for example:
`val a = if (true) 1 as Number else 2`, here we'll get useless cast

 #KT-9551 Fixed
 #KT-9645 Fixed

compiler/testData/diagnostics/tests/cast/AsInPropertyAndPropertyAccessor.txt

@@ -0,0 +1,6 @@
+package
+
+public val c1: kotlin.Number
+public val c2: kotlin.Number
+public val d: kotlin.Number
+public fun test(): kotlin.Unit