Editing timesheet record with a rate factor applied, keeps applying the factor with each edit.

[IxFail]

Describe the bug
When an entry in the timesheet is edited when it has a rate multiplier applied to it, it keeps adding the rate over the allready applied rate.

To Reproduce
Steps to reproduce the behavior:

1. Apply a rate multiplier as described Here
   For example a factor of 2.0 at Sunday.
2. Put in your hours in the timesheet as you're usually doing (at the day that the rate factor applies).
   (Example your Hourly rate is 10 and you have worked for 1 hour, you get a rate of 20 as intended)
3. Edit a something in the record, does not matter what. (example: add Test123 to the description).
4. Save the edit record.
5. See that the rate has doubled (even if you did not change the working time).
6. Edit something in the record again. (example: Change description to Test321)
7. See that the rate has doubled again.
8. Rinse and repeat with every edit.

Logfile
(Nothing gets added to the log file (Last entry 01-09-2020) problem occurred at 23-09-2020

[2020-09-01 21:48:06] security.DEBUG: Stored the security token in the session. {"key":"_security_secured_area"} []

Additional context
Add any other context about the problem here.

• Kimai version: 1.10.2 stable (Ayumi)
• PHP version: 7.3.21-1+ubuntu16.04.1+deb.sury.org+1
• MySQL: mysql Ver 14.14 Distrib 5.7.31, for Linux (x86_64) using EditLine wrapper

[github-actions]

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