fix(spoolman): save spool id in lowercase variable #2160
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Description
Fixes an issue with saving spool IDs for individual tools on a multi-tool instance. Currently, no updates are written to the variables file and an error is shown when selcting a new spool for any toolhead. The cause appears to be that upper case letters (which the current implementation uses) are not allowed. See the Klipper docs.
This PR simply changes the variable name to lower case, resolving the problem.
Running Klipper v0.12.0-451, Moonraker v0.9.3-65
Related Tickets & Documents
n/a
Mobile & Desktop Screenshots/Recordings
Console output displaying the error message:

[optional] Are there any post-deployment tasks we need to perform?
n/a
Signed-off-by: Paul Gendolla [email protected]