API: Allow to set user for timesheet

[kevinpapst]

Description

Fixes #1252

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I verified that my code applies to the guidelines (composer kimai:code-check)
• I agree that this code is used in Kimai and will be published under the MIT license

[codecov]

Codecov Report

Merging #1259 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1259      +/-   ##
============================================
+ Coverage     92.38%   92.39%   +<.01%     
- Complexity     3635     3638       +3     
============================================
  Files           362      362              
  Lines         11221    11225       +4     
============================================
+ Hits          10367    10371       +4     
  Misses          854      854

Impacted Files	Coverage Δ	Complexity Δ
src/Form/API/TimesheetApiEditForm.php	100% <100%> (ø)	3 <0> (+1)	⬆️
src/Form/TimesheetEditForm.php	86.79% <100%> (ø)	59 <0> (+2)	⬆️
src/API/TimesheetController.php	96.08% <100%> (+0.03%)	69 <0> (ø)	⬇️

[lock]

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