Fix removing pushers on python 3

[hawkowl]

No description provided.

[codecov-io]

Codecov Report

Merging #4250 into develop will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #4250      +/-   ##
===========================================
- Coverage    73.55%   73.54%   -0.01%     
===========================================
  Files          299      299              
  Lines        29806    29806              
  Branches      4872     4872              
===========================================
- Hits         21923    21921       -2     
  Misses        6456     6456              
- Partials      1427     1429       +2

Impacted Files	Coverage Δ
synapse/rest/client/v1/pusher.py	71.76% <100%> (ø)	⬆️
synapse/util/file_consumer.py	80.7% <0%> (-1.76%)	⬇️
synapse/handlers/user_directory.py	70.73% <0%> (-0.31%)	⬇️

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[richvdh]

lgtm.

For future reference: what were the symptoms of the bug? The text of the exception would be useful for searches.

[richvdh]

This is actually fixing #4222 aiui.