Restore _touchdown_... attributes before resuming function with touchdowns

[tloebhard]

Solution as described in #125

Fixes #125

[codecov]

Codecov Report

❌ Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.26%. Comparing base (bc1c81e) to head (a48efc8).
⚠️ Report is 59 commits behind head on master.

Files with missing lines	Patch %	Lines
fints/client.py	11.11%	8 Missing ⚠️

Additional details and impacted files

@@            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     

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