Simplify approvals badge in the merge requests list

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The following discussion from !149024 (merged) should be addressed:

• @slashmanov started a discussion: (+1 comment)

  WDYT of just removing the icon when there's no self approval?

  

  Alternatively, we could simplify that like this: 👨✓ 0/1 instead of 👨✓ 0 of 1 Approvals. It just feels weird that all the other statuses are using icons but the approval status has it spelled out.