Fix "unexpected error type" exception in initializer -> getter

So #KT-19674 Fixed

idea/testData/intentions/convertPropertyInitializerToGetter/errorType.kt

@@ -0,0 +1,8 @@
+// SKIP_ERRORS_BEFORE
+// SKIP_ERRORS_AFTER
+
+class Some
+
+class Other {
+    val x = Some<caret>
+}

idea/testData/intentions/convertPropertyInitializerToGetter/errorType.kt.after

@@ -0,0 +1,9 @@
+// SKIP_ERRORS_BEFORE
+// SKIP_ERRORS_AFTER
+
+class Some
+
+class Other {
+    val x
+        get() = Some
+}