Fix small issues

upgradeNextcloud.sh

 #!/bin/bash
 NEXTCLOUD_INSTALL_DIR=${NEXTCLOUD_INSTALL_DIR:-'/var/www/nextcloud'}
+NEXTCLOUD_INSTALL_DIR=`echo $NEXTCLOUD_INSTALL_DIR | sed 's@/*$@@'`
 htuser=${htuser:-'www-data'}
 ocupdater=${ocupdater:-"$NEXTCLOUD_INSTALL_DIR/updater/updater.phar"}
 occ=$NEXTCLOUD_INSTALL_DIR/occ

upgradeTetrasBack.sh

 #!/bin/bash
+OLD=`pwd`
 cd `dirname $0`/Tetras-back
 git pull
 make dependencies
 make
+cd $OLD