PR: Change contract search radius minimum to 1 instead of 100

[psikomonkie]

The MekHQ campaign contract market setting "Search Radius" had a minimum value of 100. It is now 1. The default is still 300 / whatever the preset defines.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 13.13%. Comparing base (404ea62) to head (23e7804).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...mekhq/gui/campaignOptions/contents/MarketsTab.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8748      +/-   ##
============================================
- Coverage     13.14%   13.13%   -0.01%     
+ Complexity     7828     7825       -3     
============================================
  Files          1306     1306              
  Lines        169092   169092              
  Branches      25422    25422              
============================================
- Hits          22220    22204      -16     
- Misses       144732   144746      +14     
- Partials       2140     2142       +2     

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