fdo#67104 Use correct command for show grid

Not sure why .uno:ViewGridLines & SID_SCGRIDSHOW were
introduced (in "merge sidebar feature" and related commits).

Reviewed-on: https://gerrit.libreoffice.org/8459
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit c3403ac888c2e62edaf8befe7982f5f8cc95c16f)

Conflicts:
	sc/sdi/scalc.sdi
	sc/source/ui/sidebar/CellAppearancePropertyPanel.cxx

Change-Id: I90bdfaef86adcbfa44129b8f7f9df61ca7f35114
Reviewed-on: https://gerrit.libreoffice.org/8463
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>