VBoxLinuxAdditions's install.sh takes 'force' sub-command, not '--force' option
VBoxLinuxAdditions's install.sh takes 'force' sub-command, not '--force' option

This patch fixes a mistake in update-guest-additions which caused it to invoke
the VirtualBox Guest Additions installation script with incorrect command-line
arguments.

Bug: 51471
Change-Id: I40f7d865aa758be8001184c8fc4a80812f6d6e99

stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,HarriAlasi/wiki3dviewer,ankita-kumari/mediawiki-vagrant,huit/mediawiki-vagrant,HarriAlasi/wiki3dviewer,huit/mediawiki-vagrant,wikimedia/mediawiki-vagrant,huit/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,stuartbman/mediawiki-vagrant,wikimedia/mediawiki-vagrant,physikerwelt/DRMF-vagrant,stuartbman/mediawiki-vagrant,physikerwelt/DRMF-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,ankita-kumari/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,wikimedia/mediawiki-vagrant,huit/mediawiki-vagrant,HarriAlasi/wiki3dviewer,ankita-kumari/mediawiki-vagrant,physikerwelt/DRMF-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant,huit/mediawiki-vagrant,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,physikerwelt/DRMF-vagrant