java: fix completing class name in its supertype's second generic type argument

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

@@ -0,0 +1,2 @@
+interface Super<A,B> {}
+class Sub implements Super<Sub, Su<caret>> {}

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

@@ -0,0 +1,2 @@
+interface Super<A,B> {}
+class Sub implements Super<Sub, Sub<caret>> {}