Fix HTTP accept header parsing for proper application/vnd.ddel.* format
Fix HTTP accept header parsing for proper application/vnd.ddel.* format

Regression from PR: https://github.com/dresden-elektronik/deconz-rest-plugin/pull/3703
dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin