refactor($compile): improve readability on conditional assignment

Use ternary operator instead of if statement

Closes #5065

Author: dimirc

src/ng/compile.js

@@ -1417,11 +1417,9 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
       function nodeLinkFn(childLinkFn, scope, linkNode, $rootElement, boundTranscludeFn) {
         var attrs, $element, i, ii, linkFn, controller, isolateScope, elementControllers = {}, transcludeFn;
 
-        if (compileNode === linkNode) {
-          attrs = templateAttrs;
-        } else {
-          attrs = shallowCopy(templateAttrs, new Attributes(jqLite(linkNode), templateAttrs.$attr));
-        }
+        attrs = (compileNode === linkNode)
+          ? templateAttrs
+          : shallowCopy(templateAttrs, new Attributes(jqLite(linkNode), templateAttrs.$attr));
         $element = attrs.$$element;
 
         if (newIsolateScopeDirective) {