Allow to remove a Safe-app added manually

[nicosampler]

Closes #1014.
This PR Allows removing a Safe-app (added manually) from Manage Apps modal.

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[lukasschor]

I added an app manually, but it does not allow me to remove it.

Update: Only after reloading the page I can remove it.

[mmv08]

nitpick: this could've been a one-liner using .filter

[nicosampler]

reimplemented

[mmv08]

Could you please include meaningful PR name instead of just a number next time?

[nicosampler]

@lukasschor should be working now

[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[francovenica]

• Was able to delete the apps
• Was able to delete an app as soon as I loaded it without the need to reload the page
• Was able to add an app after I deleted it without the need to reload the page (Was afraid to get the error of "already present app")

Issues:
I was able to delete any app at some point, (all the trashcan icons were red) and I deleted Sablier which is one of the apps that is there by default, after reloading the page refreshing the cache the Sablier app is there again.
Note: the "Request app" in the snapshot is one I added manually from other build and that's why it probably is allowing its deletion even when being an default app

[francovenica]

Tried in incognito again, and eve after hard reload with clean cache and cleaning the storage I still can delete the default apps

[mmv08]

Please address the comments before merging, otherwise it seems good 👍

[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[ghost]

Travis automatic deployment:
https://pr1260--safereact.review.gnosisdev.com/app

[francovenica]

An issue that wans't allowing the user to delete a custom app after reloading the page was fixed

I tried by adding this App: https://ipfs.io/ipfs/Qmbn1LskQAgbtXbzRh3scSxa8VCgHKKuPJPFZiWiK4WgPD/

And making sure you can delete it whenever you need and add it again as well

Looks good to me