Don't skip ComStar as an origin faction

[sixlettervariables]

I misunderstood the usage of the INACTIVE tag when I wrote the random origin code, and this fixes it such that ComStar can be selected as a random origin. This also adds the SPECIAL tag to the reject list, otherwise "All Clans" shows up.

I believe this passes the bar of being simple enough for Stable.

[codecov]

Codecov Report

Merging #2354 (8b90434) into master (3c8a806) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2354      +/-   ##
============================================
- Coverage     10.32%   10.32%   -0.01%     
+ Complexity     3413     3411       -2     
============================================
  Files           673      673              
  Lines         94639    94641       +2     
  Branches      15908    15909       +1     
============================================
- Hits           9776     9772       -4     
- Misses        83492    83497       +5     
- Partials       1371     1372       +1     

Impacted Files	Coverage Δ	Complexity Δ
...mekhq/campaign/universe/RangedFactionSelector.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
MekHQ/src/mekhq/campaign/universe/Systems.java	41.43% <0.00%> (-0.80%)	35.00% <0.00%> (-1.00%)
...ekHQ/src/mekhq/campaign/market/ContractMarket.java	58.07% <0.00%> (-0.40%)	112.00% <0.00%> (-1.00%)
MekHQ/src/mekhq/campaign/mission/AtBContract.java	19.10% <0.00%> (-0.12%)	64.00% <0.00%> (-1.00%)
...ekhq/campaign/universe/RandomFactionGenerator.java	60.58% <0.00%> (+0.41%)	65.00% <0.00%> (+1.00%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3c8a806...5b548ce. Read the comment docs.