Restore _touchdown_... attributes before resuming function with touchdowns

[tloebhard]

Solution as described in #125

Fixes #125

[codecov[bot]]

Codecov Report

Merging #126 (a48efc8) into master (bc1c81e) will decrease coverage by 0.21%. The diff coverage is 11.11%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   87.48%   87.26%   -0.22%     
==========================================
  Files          23       23              
  Lines        3117     3126       +9     
==========================================
+ Hits         2727     2728       +1     
- Misses        390      398       +8     

Impacted Files	Coverage Δ
fints/client.py	70.40% <11.11%> (-0.78%)	:arrow_down:

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