method ref completion: allow non static methods (IDEA-92705)

java/java-tests/testData/codeInsight/completion/normal/MethodReferenceNoStatic.java

@@ -0,0 +1,8 @@
+import java.util.*;
+
+class Test {
+    void aaa(Test p) { return 1; }
+    void test() {
+        Comparator<Test> r2 = Test::<caret>
+    }
+}