fix(orderBy): remove redundant if statement

Removed unnecessary additional conditional statement.

Author: ItsLeeOwen

src/ng/filter/orderBy.js

@@ -125,8 +125,10 @@ function orderByFilter($parse){
       var t1 = typeof v1;
       var t2 = typeof v2;
       if (t1 == t2) {
-        if (t1 == "string") v1 = v1.toLowerCase();
-        if (t1 == "string") v2 = v2.toLowerCase();
+        if (t1 == "string") {
+           v1 = v1.toLowerCase();
+           v2 = v2.toLowerCase();
+        }
         if (v1 === v2) return 0;
         return v1 < v2 ? -1 : 1;
       } else {