KT-9835 Completion thinks receiver is nullable when it is not

#KT-9835 Fixed

idea/idea-completion/testData/basic/multifile/KT9835/KT9835.java

@@ -0,0 +1,4 @@
+public interface R<D extends I> {
+    int getFoo();
+    int f();
+}

idea/idea-completion/testData/basic/multifile/KT9835/KT9835.kt

@@ -0,0 +1,8 @@
+interface I
+
+fun foo(r: R<out I>) {
+    r.<caret>
+}
+
+// EXIST: { itemText: "foo", tailText: " (from getFoo())", typeText: "Int", attributes: "bold" }
+// EXIST: { itemText: "f", tailText: "()", typeText: "Int", attributes: "bold" }