chore: change send_tokens visibility

[r4mmer]

Acceptance criteria

• change visibility of /thin_wallet/send_tokens to private

[codecov[bot]]

Codecov Report

Merging #337 (07037d1) into dev (9b876ad) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #337      +/-   ##
==========================================
- Coverage   82.14%   82.12%   -0.03%     
==========================================
  Files         154      154              
  Lines       14687    14687              
  Branches     2104     2104              
==========================================
- Hits        12065    12061       -4     
- Misses       2188     2191       +3     
- Partials      434      435       +1     

Impacted Files	Coverage Δ
hathor/wallet/resources/thin_wallet/send_tokens.py	68.96% <ø> (ø)
hathor/p2p/manager.py	68.28% <0.00%> (-1.50%)	:arrow_down:

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