scripts: setup app layer rustfmt mod.rs last

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
None, just a script warning removal

Describe changes:

• scripts: setup app layer does rustfmt mod.rs last

Otherwise rustfmt mod.rs complains that parser.rs does not exist yet

[jasonish]

Should be backported to 8 as well.

[suricata-qa]

Information: QA skipped due to no C or rust code changed detected. Set to force a run.

Pipeline = code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.81%. Comparing base (9fb33bb) to head (176ee03).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13911      +/-   ##
==========================================
+ Coverage   78.66%   83.81%   +5.15%     
==========================================
  Files        1009     1009              
  Lines      275527   275551      +24     
==========================================
+ Hits       216730   230949   +14219     
+ Misses      58797    44602   -14195     

Flag	Coverage Δ
fuzzcorpus	63.49% <ø> (?)
livemode	19.00% <ø> (+<0.01%)	⬆️
pcap	44.75% <ø> (+0.02%)	⬆️
suricata-verify	65.13% <ø> (-0.02%)	⬇️
unittests	59.17% <ø> (ø)

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[victorjulien]

Merged in #13926, thanks!