[FIR] Expand type of const val in FirConstPropertyChecker

compiler/fir/analysis-tests/testData/resolve/constVal/constValWithTypealiasType.fir.txt

@@ -0,0 +1,4 @@
+FILE: constValWithTypealiasType.kt
+    public final typealias Foo = R|kotlin/Int|
+    public final const val x: R|Foo| = Int(10)
+        public get(): R|Foo|

compiler/fir/analysis-tests/testData/resolve/constVal/constValWithTypealiasType.kt

@@ -0,0 +1,3 @@
+typealias Foo = Int
+
+const val x: Foo = 10