[FIR] Report UNINITIALIZED_VARIABLE for top-level properties

When checking top-level properties, check with initialization enabled.
This makes sure the same errors are reported for member and top-level
properties.

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/ControlFlowGraph.kt

@@ -34,6 +34,7 @@ class ControlFlowGraph(val declaration: FirDeclaration?, val name: String, val k
     enum class Kind {
         File,
         Class,
+        Constructor,
         Function,
         LocalFunction,
         AnonymousFunction,