[Fix] User can delete any event (Front-end)

[AdityaBirangal]

What kind of change does this PR introduce?
fix #832

Did you add tests for your changes?
No

If relevant, did you update the documentation?
Not required

Summary
Front-end (Flutter) part fixed
Back-end (API) will be get fixed in PalisadoesFoundation/talawa-api#261

Does this PR introduce a breaking change?
Nope

Other information
Github Externship Appication No. : 20-05_Adi500_tfa_262

[TheHazeEffect]

I'm thinking Users shouldn't even see an option to delete if they are unable to,
What do you think? @palisadoes

[palisadoes]

@TheHazeEffect, @AdityaBirangal Yes, that's true. The additional security of them not being able to do it in the API is going to be added. I'll open a bug issue for that.

The option should be removed in the app like you said.

[TheHazeEffect]

@AdityaBirangal could you go ahead and hide the button for those who are unable to delete?
Apart from that everything else is solid, I'll review and merge it right after

[AdityaBirangal]

It will be good as per users perspective if he/she didn't see an option to delete if he/she is not allowed.

I did required changes @TheHazeEffect
Please review it & let me know if any updates are required...

[palisadoes]

@Sagar2366 @DeltaHarbinger Please take a look.

[AdityaBirangal]

Done 👍🏻
@TheHazeEffect

[TheHazeEffect]

Resolves Issue #832 for the Mobile application

Ready to be merged

I believe work still needs to be done to check user permission level in the api
to protect against direct requests, Probably best done by checking user's permission level by token.

[AdityaBirangal]

Yeah.
API level updates are in progress at PalisadoesFoundation/talawa-api#261