KT-1920 Don't complete java.lang.Double for the prefix Double

#KT-1920 fixed

idea/testData/completion/basic/StandardJetDoubleFirst.kt

@@ -0,0 +1,7 @@
+fun some(a: Double<caret>) {
+}
+
+// COMPLETE: 2
+// WITH_ORDER: 1
+// EXIST: Double~(jet)
+// EXIST: Double~(java.lang)

idea/tests/org/jetbrains/jet/completion/JetBasicCompletionTest.java

@@ -149,6 +149,10 @@ public class JetBasicCompletionTest extends JetCompletionTestBase {
         doTest();
     }
 
+    public void testStandardJetDoubleFirst() {
+        doTest();
+    }
+
     public void testSubpackageInFun() {
         doTest();
     }