Fix timeout override

[tremby]

Closes #332

[codecov-io]

Codecov Report

Merging #333 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #333   +/-   ##
=======================================
  Coverage   90.39%   90.39%           
=======================================
  Files          43       43           
  Lines        2843     2843           
=======================================
  Hits         2570     2570           
  Misses        273      273

Impacted Files	Coverage Δ
django_q/tasks.py	99.46% <ø> (ø)	⬆️
django_q/cluster.py	91.64% <100%> (ø)	⬆️

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[Koed00]

Need to check if this doesn't conflict with @jannero 's fixes.
But I'm reviewing all this from my phone. Will run checks when I'm in the office again.

[tremby]

See #332 for some discussion -- a question has been raised of whether the bug is in the code (if so, this PR fixes it), or in the documentation (in which case this PR is redundant but a documentation change is required).