bug: (snitch_stream) fix stride pattern repeat param parsing

[superlopuh]

I did not add a test and am paying the price.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.83%. Comparing base (edeae99) to head (c201f29).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2986      +/-   ##
==========================================
- Coverage   89.85%   89.83%   -0.02%     
==========================================
  Files         409      410       +1     
  Lines       51060    51420     +360     
  Branches     7916     7996      +80     
==========================================
+ Hits        45879    46194     +315     
- Misses       3928     3951      +23     
- Partials     1253     1275      +22     

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