fix(vagrant): sets video RAM to 8 MB, avoids large default (256) (#4230)

Vagrantfile

@@ -120,6 +120,7 @@ Vagrant.configure("2") do |config|
         vb.cpus = $vm_cpus
         vb.gui = $vm_gui
         vb.linked_clone = true
+        vb.customize ["modifyvm", :id, "--vram", "8"] # ubuntu defaults to 256 MB which is a waste of precious RAM
       end
 
       node.vm.provider :libvirt do |lv|