apply start-matching case-insensitively whatever the completion matching option is

java/java-tests/testData/codeInsight/completion/normalSorting/EnumConstantStartMatching.java

@@ -0,0 +1,12 @@
+public class Foo {
+  
+  Zoo foo() {
+    return r<caret>
+  }
+
+  void rMethod() {}
+}
+
+enum Zoo {
+  LEFT, RIGHT
+}