Bug 12220 - bootstrap not responsive on all devices

Bug 12220 - bootstrap not responsive on all devices

The bootstrap theme includes a meta tag attribute which disables zooming
on some devices. This was unintentional and not desirable. This patch
removes the problematic attribute.

See:
http://blog.javierusobiaga.com/stop-using-the-viewport-tag-until-you-know-ho

To test: Apply the patch and view the OPAC on a device with a touch
interface. Attempt to zoom in on any OPAC page. Zooming should work.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Reproduced using a smartphone.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>