Completion: assign highest priority to dsl members in dsl context

Use the same style as for dsl for lookup items that belong to dsl

idea/idea-completion/testData/weighers/basic/DslCalls.kt

@@ -0,0 +1,20 @@
+// RUNTIME
+package test
+
+import bar.r
+import bar.foo3
+
+fun main() {
+    val foo5 = 3
+    r {
+        foo<caret>
+    }
+}
+
+// ORDER: foo2
+// ORDER: foo4
+// ORDER: fooloooooong
+// ORDER: foo3
+// ORDER: foo5
+// ORDER: fooval
+// ORDER: foo1