Use proper exit code for composer lint

[MorrisJobke]

See nextcloud/server#20952

[codecov-io]

Codecov Report

Merging #2267 into master will decrease coverage by 66.75%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #2267       +/-   ##
=============================================
- Coverage     94.41%   27.66%   -66.76%     
  Complexity      103      103               
=============================================
  Files             7      143      +136     
  Lines           394     5281     +4887     
  Branches          0      797      +797     
=============================================
+ Hits            372     1461     +1089     
- Misses           22     3820     +3798     

Flag	Coverage Δ	Complexity Δ
#javascript	22.28% <ø> (?)	0.00 <ø> (?)
#php	94.41% <ø> (ø)	103.00 <ø> (ø)

Impacted Files	Coverage Δ	Complexity Δ
src/fullcalendar/eventOrder.js	100.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/main.js	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/components/Editor/Repeat/RepeatSummary.vue	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
.../CalendarList/CalendarListItemSharingShareItem.vue	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/utils/logger.js	85.71% <0.00%> (ø)	0.00% <0.00%> (?%)
src/fullcalendar/eventClick.js	100.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/fullcalendar/eventSourceFunction.js	95.91% <0.00%> (ø)	0.00% <0.00%> (?%)
src/components/AppNavigation/Settings.vue	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/store/calendarObjects.js	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
src/models/contact.js	100.00% <0.00%> (ø)	0.00% <0.00%> (?%)
... and 126 more

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