Added support for case-insensitive jobmasks to the itemdb converter
Added support for case-insensitive jobmasks to the itemdb converter

- Fixes parsing failures due to lower- (or mixed-) case job masks.
- Special thanks to ossi0110 for the report.

Signed-off-by: Haru <f7976dc425bcce048120127956a7ec59259f4452@dotalux.com>

Nipol/Siesta,Nipol/Siesta,Nipol/Siesta