Greyed out icon are the same as normal one with breezy theme

We should instead divide opacity by 2 or something like this.

(from redmine: issue id 4910, created on 2016-06-22, closed on 2016-06-23)

• Changesets:
  • Revision 6be21724 on 2016-06-23T08:50:11.000Z:

Fixes #4910 Disabled icons now have reduced opacity as well (useful for breezy)

• Revision a17f6b85 on 2016-06-23T08:51:31.000Z:

Fixes #4910 Disabled icons now have reduced opacity as well (useful for breezy)

• Custom Fields:
  • Bug in version: 1.0.13
• Uploads:
  • Breezy with opacity/2 (+ grayscale)
  • Default with opacity/2 + grayscale
  • Default with grayscale