java completion: don't delete everything if class name coincides with package (IDEA-180284)

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

@@ -0,0 +1,5 @@
+public class Util {
+  int goo() {
+      new Apple<caret>
+  }
+}

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

@@ -0,0 +1,7 @@
+import Apple.Apple;
+
+public class Util {
+  int goo() {
+      new Apple()<caret>
+  }
+}