[rust] remove is_started condition check because telemetry_command_tx…

[glcrazier]

… is suffice to tell

Which Issue(s) This PR Fixes

Fixes #707

Brief Description

There is no need to check is_started because telemetry_command_tx is suffice to tell if client is ready.

How Did You Test This Change?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.60%. Comparing base (430ed16) to head (0fbb1b3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #711      +/-   ##
============================================
- Coverage     56.05%   47.60%   -8.45%     
  Complexity      664      664              
============================================
  Files           259      207      -52     
  Lines         15856    12353    -3503     
  Branches       4089     3705     -384     
============================================
- Hits           8888     5881    -3007     
+ Misses         6679     6183     -496     
  Partials        289      289              

Flag	Coverage Δ
nodejs	?
rust	79.70% <ø> (+0.73%)	⬆️

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[lizhanhui]

Looks good