Werk #13414: Fix copying of views into dashboard

The following error was shown after copying the "allservices" view into a dashboard (create new dashboard; choose "Add" -> "Copy of existing view"; choose "allservices").

Cannot load dashboards from /omd/sites/site/var/check_mk/web/cmkadmin/user_dashboards.mk: invalid syntax (, line 1)

The error was permanent, no dashboards could be viewed or edited. The error could be resolved by removing a single l before a " from the file mentioned in the error message.

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