Categories appear several times #307

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.2.2

Affected Android/Custom ROM version

Lineageos 21

Affected device model

Samsung Galaxy S10

How did you install the app?

F-Droid / IzzyOnDroid

Steps to reproduce the bug

1. Open a contact
2. Choose categories

Expected behavior

I propose to merge Categories with Same text.

Actual behavior

Categories which are used in several addressbook appear several times

Screenshots/Screen recordings

No response

Additional information

No response