Define torque abs value only once

[urfeex]

To make it easier to change the example for manual testing, let's define the target torque's absolute value in one place only.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                Coverage Diff                @@
##             torque_control     #361   +/-   ##
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  Coverage                  ?   76.43%           
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  Files                     ?       92           
  Lines                     ?     4214           
  Branches                  ?      459           
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  Hits                      ?     3221           
  Misses                    ?      759           
  Partials                  ?      234           

Flag	Coverage Δ
start_ursim	82.02% <ø> (?)
ur5-3.14.3	74.85% <ø> (?)
ur5e-10.7.0	69.76% <ø> (?)
ur5e-5.9.4	74.80% <ø> (?)

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