tdf#105204 fix shellcheck warnings in sysui/desktop/solaris

double quote to prevent word splitting

Change-Id: Ice4380cc390487277a359b8db3f2fae3603b7747
Reviewed-on: https://gerrit.libreoffice.org/37466Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

sysui/desktop/solaris/postinstall

@@ -27,7 +27,7 @@ rm -f "$tiptoe"
 
 # update shared mime database
 if [ -x /usr/bin/update-mime-database ]; then
-  update-mime-database ${PKG_INSTALL_ROOT}/usr/share/mime
+  update-mime-database "${PKG_INSTALL_ROOT}"/usr/share/mime
 fi
 
 if [ -x /usr/bin/update-desktop-database ]; then

sysui/desktop/solaris/postremove

@@ -27,7 +27,7 @@ rm -f "$tiptoe"
 
 # update shared mime database
 if [ -x /usr/bin/update-mime-database ]; then
-  update-mime-database ${PKG_INSTALL_ROOT}/usr/share/mime
+  update-mime-database "${PKG_INSTALL_ROOT}"/usr/share/mime
 fi
 
 exit 0