Remove workaround for images

Not needed anymore.
1 job for !119 with 5.5 in 60 minutes (queued for 37 seconds)
latest detached
Status Job ID Name Coverage
  Build
failed #39817
linux kf5-qt5 qt5.12

01:00:00

 
Name Stage Failure
failed
linux kf5-qt5 qt5.12 Build The script exceeded the maximum execution time set for the job
        Start  77: test_lldbformatters
kf5.kinit.klauncher: new app ":1.42"
kf5.kinit.klauncher: new app "org.kdevelop.kdevplatform-lock-9c21b66a-64e6-4834-ac39-552e6c9ee650"
77/123 Test #77: test_lldbformatters ..................... Passed 2.66 sec
Start 78: test_gdb
kf5.kinit.klauncher: new app ":1.43"
kf5.kinit.klauncher: new app "org.kdevelop.kdevplatform-lock-9c377f73-9512-4aa2-a741-2be5bacc2b52"
Pulling docker image gitlab/gitlab-runner-helper:x86_64-1b659122 ...
ERROR: Job failed: execution took longer than 1h0m0s seconds