The delete remove button on the list of owners should not be active only there is one owner



## Steps to Reproduce

1. The gem has one owner and it is me
2. Check the owners page


## Expected Behavior
The "Remove" button should not be shown at all

## Current Behavior
I can click on the "Remove", it doesn't remove it at all and doesn't show any error either.

## Possible Solution
Do not show the "Remove" button if there is only one owner

## Environment