Fix alert filter with check_definition_id

[mohabusama]

Fix #45

[codecov-io]

Codecov Report

Merging #50 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #50      +/-   ##
=========================================
+ Coverage   74.75%   74.8%   +0.04%     
=========================================
  Files          19      19              
  Lines        1018    1020       +2     
=========================================
+ Hits          761     763       +2     
  Misses        257     257

Impacted Files	Coverage Δ
zmon_cli/cmds/alert.py	67.05% <100%> (+0.79%)	:white_check_mark:

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[elauria]

👍

[mohabusama]

👍