FIR: Resolve error expression in initializer of FirField

^KT-54775 Fixed

compiler/fir/analysis-tests/testData/resolve/kt54775.kt

@@ -0,0 +1,8 @@
+fun <T> bar(): T {
+    return null <!UNCHECKED_CAST!>as T<!>
+}
+
+class X() : <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>B<!> by <!ASSIGNMENT_IN_EXPRESSION_CONTEXT!><!VARIABLE_EXPECTED!>get()<!> = bar()<!> {
+    val prop = <!ASSIGNMENT_IN_EXPRESSION_CONTEXT!><!VARIABLE_EXPECTED!>bar()<!> = 2<!>
+}
+