Fix cherry-pick conflict in templates.js

Small fix to use 'reachable' instead of 'available' as the JSON property being bound to is 'reachable'.

This allows the "RAM Usage" bar-graphs to be rendered correctly.

See support ticket #5675

Conflicts:

	priv/admin/js/generated/templates.js
Merge pull request #142 from basho/jgn-develop-template-fix-1.4

Fix cherry-pick conflict in templates.js