break from loop once a valid policy is found. remove old unused list

[af7567]

get_patch_policy() was always going through to the end of the agent policies list instead of breaking from the loop once a valid policy is found. Since get_agent_policies() returns the list in order of preference, the least preferred policy was always getting selected.

Also removed the processed_policies list which is not used, seems to be left over from when the policy was selected a different way.

Fixes #1293

[codecov]

Codecov Report

Merging #1301 (db45400) into develop (ade1a73) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop    #1301      +/-   ##
===========================================
- Coverage    82.42%   82.40%   -0.02%     
===========================================
  Files          114      114              
  Lines         7498     7498              
===========================================
- Hits          6180     6179       -1     
- Misses        1318     1319       +1     

Impacted Files	Coverage Δ
api/tacticalrmm/agents/models.py	71.35% <50.00%> (-0.19%)	⬇️

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[wh1te909]

thank you!