fix arch-boxes role

Make sure to use {{ variable }} instead of {{variable}}.
Also we need to ensure git is instaled when using the git module.

roles/arch-boxes/tasks/main.yml

 ---
 
 - name: install arch-boxes dependencies
-  pacman: name=packer,virtualbox,qemu-headless,virtualbox-host-modules-arch,python,python-urllib3 state=present
+  pacman: name=git,packer,virtualbox,qemu-headless,virtualbox-host-modules-arch,python,python-urllib3 state=present
 
 - name: create arch-boxes user
   user: name={{ archboxes_user }} shell=/bin/bash home="{{ archboxes_home }}" createhome=yes
 
 - name: clone arch-boxes repository
-  git: repo='https://github.com/archlinux/arch-boxes.git' dest="{{ archboxes_git_dir }}" force=yes version="{{archboxes_version}}"
+  git: repo='https://github.com/archlinux/arch-boxes.git' dest="{{ archboxes_git_dir }}" force=yes version="{{ archboxes_version }}"
 
 - name: load virtualbox kernel modules
-  modprobe: name="{{item}}" state=present
+  modprobe: name="{{ item }}" state=present
   with_items: ['vboxdrv', 'vboxnetadp', 'vboxnetflt']
 
 - name: add modules-load config for virtualbox