"Split property declaration" intention: do not suggest in 'when' subject

#KT-35528 Fixed

idea/testData/intentions/declarations/split/whenSubject.kt

@@ -0,0 +1,13 @@
+// IS_APPLICABLE: false
+enum class Type {
+    HYDRO,
+    PYRO
+}
+
+fun select(t: Type): Int {
+    return when (<caret>val i = t.ordinal) {
+        0 -> 1
+        1 -> 42
+        else -> i
+    }
+}