Can be private: simplification

Related to KT-22030

idea/testData/inspectionsLocal/memberVisibilityCanBePrivate/sameClassFunctionCall.kt

@@ -0,0 +1,7 @@
+open class A {
+    <caret>internal fun foo() {}
+
+    fun bar(a: A) {
+        a.foo()
+    }
+}

idea/testData/inspectionsLocal/memberVisibilityCanBePrivate/sameClassFunctionCall.kt.after

@@ -0,0 +1,7 @@
+open class A {
+    private fun foo() {}
+
+    fun bar(a: A) {
+        a.foo()
+    }
+}