[TASK] Make DmWidget dashboard compatible with TYPO3 v12

[ziadabdulhai]

Under TYPO3 V12 ich receive this error: Core: Exception handler (WEB): Uncaught TYPO3 Exception: #1257246929: Tried resolving a template file for controller action "Default->DmWidget" in format ".html", but none of the paths contained the expected template file (Default/DmWidget.html).