[FIX] fakewallet: set tag of description_hash invoice correctly

[callebtc]

When using description_hash the tag h needs to be set.

[codecov-commenter]

Codecov Report

Merging #1901 (048457d) into main (b0ad47b) will increase coverage by 1.25%.
Report is 9 commits behind head on main.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main    #1901      +/-   ##
==========================================
+ Coverage   56.36%   57.62%   +1.25%     
==========================================
  Files          49       49              
  Lines        7524     8684    +1160     
==========================================
+ Hits         4241     5004     +763     
- Misses       3283     3680     +397     

Files Changed	Coverage Δ
lnbits/wallets/fake.py	74.57% <100.00%> (+0.66%)	⬆️

... and 29 files with indirect coverage changes

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