Add A Loader To Mess Rebate Form

[Shivam Kumar Jha]

For the mess rebate form, we should add GIF loaders whenever we are waiting for a response to come.

It can simply be a loader that takes over the entire form while it is fetching information.

cc/ @139Vaibhav @LIGHT1210 Please finish this by Monday.

[Shivam Kumar Jha]

Thanks a lot @LIGHT1210 for fixing the issue.

fixed via #62