Option to ignore the fact that the app is signed with a different certificate

**Is your feature request related to a problem? Please describe.**
I have some apps installed through the Play Store and those apps are also available on F-Droid and some other repos but currently they can't be updated through Droid-ify because they are signed with different certificates. I also happen to have installed the Core Patch xposed module so this is a non-issue.

**Describe the solution you'd like**
An option to ignore such warnings and try to install the app anyways.

**Describe alternatives you've considered**
I can't uninstall the apps (which are a lot) because I will lose all data on them.
I've considered backing up and restoring the data but that would be such amount of work (because I don't have enough free space to batch backup all the apps in one go) that is really not needed as I can install apps signed with different certificates.

**Additional context**
This is specially needed when you set up your own repo and sign the APKs with your own key, which is my case.