fix duplicate args for collector_encryption

[vetinari]

this may happen if someone already uses collector_encryption...

[codecov[bot]]

Codecov Report

Merging #43 into master will decrease coverage by 0.26%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   98.63%   98.36%   -0.27%     
==========================================
  Files           9        9              
  Lines         366      368       +2     
==========================================
+ Hits          361      362       +1     
- Misses          5        6       +1     

Impacted Files	Coverage Δ
opentracing_utils/tracers.py	85.00% <50.00%> (-1.85%)	:arrow_down:

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[vetinari]

:+1:

[vetinari]

see also https://github.com/zalando-zmon/opentracing-utils/commit/24821cab969cab6c8ef840a8977c60a4857ac15f#r43044567

[vetinari]

:+1:

[mohabusama]

👍