Handle case when lone wildcard is ORed with other constraints

[fredden]

While working on another feature, I noticed that a constraint like * || 1.2.3 wasn't being normalised to just * as expected. This pull request fixes this oversight.

While working on this change, I noticed that a constraint like *, 1.2.3 isn't normalised to 1.2.3. Let's deal with this in a separate step. (It's late here and I'm tired.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (0b0ef26) to head (185a788).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1186   +/-   ##
=========================================
  Coverage     96.49%   96.50%           
- Complexity      196      197    +1     
=========================================
  Files            32       32           
  Lines           828      830    +2     
=========================================
+ Hits            799      801    +2     
  Misses           29       29           

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