Fix receive spelling and add whitespace

Found `recieve` next to the correctly spelled method name, fixed it.

Also we prefer a one space padding within hashes, add that.

actioncable/test/channel/base_test.rb

@@ -62,7 +62,7 @@ def get_latest
     end
 
     def receive
-      @last_action = [ :recieve ]
+      @last_action = [ :receive ]
     end
 
     private
@@ -140,7 +140,7 @@ def rm_rf
   test "should dispatch recieve action when perform_action is called with empty action" do
     data = { 'content' => 'hello' }
     @channel.perform_action data
-    assert_equal [ :recieve ], @channel.last_action
+    assert_equal [ :receive ], @channel.last_action
   end
 
   test "transmitting data" do