Fix dashboard widget issue at first startup.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1197 3c3d7b80-5828-415e-9f61-280b98178fff
Randomly create x/y start position for a new dashboard widget.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1198 3c3d7b80-5828-415e-9f61-280b98178fff