fix: txn command key

[bsbds]

Closes: #470

Based on: #469

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (c8aa843) 63.34% compared to head (189478e) 63.58%.

Files	Patch %	Lines
xline/src/server/lease_server.rs	0.00%	11 Missing ⚠️
xlineapi/src/command.rs	88.29%	11 Missing ⚠️
xline-client/src/clients/kv.rs	40.00%	3 Missing ⚠️
xline-client/src/clients/lease.rs	0.00%	2 Missing ⚠️
xline-client/src/clients/auth.rs	0.00%	1 Missing ⚠️
xline-client/src/clients/lock.rs	0.00%	1 Missing ⚠️
xline/src/server/auth_server.rs	50.00%	1 Missing ⚠️
xline/src/server/kv_server.rs	66.66%	1 Missing ⚠️
xline/src/server/lock_server.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
+ Coverage   63.34%   63.58%   +0.23%     
==========================================
  Files         102      102              
  Lines       18540    18585      +45     
  Branches    18540    18585      +45     
==========================================
+ Hits        11745    11818      +73     
+ Misses       6065     6034      -31     
- Partials      730      733       +3     

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[Phoenix500526]

LGTM

[iGxnon]

LGTM