[FIR] Use type without smartcast for local variable with smartcasted initializer

compiler/testData/ir/irText/declarations/localDelegatedProperties.fir.kt.txt

@@ -22,7 +22,7 @@ fun test2() {
     }
 
   <set-x>(<set-?> = 0)
-  val <unary>: Int = <get-x>()
+  val <unary>: Int? = <get-x>()
   <set-x>(<set-?> = <unary>.inc())
   <unary> /*~> Unit */
   <set-x>(<set-?> = <get-x>().plus(other = 1))