Change parameter type: Make parameter type nullable (instead of Nothing?) if null is passed as an argument

#KT-6634 Fixed

idea/testData/quickfix/typeMismatch/afterNullArgumentForNonNullParameter.kt

@@ -0,0 +1,8 @@
+// "Change parameter 's' type of primary constructor of class 'Foo' to 'String?'" "true"
+class Foo(s: String?) {
+
+}
+
+fun test() {
+    Foo(null)
+}

idea/testData/quickfix/typeMismatch/beforeNullArgumentForNonNullParameter.kt

@@ -0,0 +1,8 @@
+// "Change parameter 's' type of primary constructor of class 'Foo' to 'String?'" "true"
+class Foo(s: String) {
+
+}
+
+fun test() {
+    Foo(<caret>null)
+}