Fix ugly inactive Edit tab button images for Linux (BL-3714) (#1386)
Fix ugly inactive Edit tab button images for Linux (BL-3714) (#1386)

I couldn't figure out any fix for the unreadable text of Publish tab
buttons, but I think they're hard to read only when the buttons are
inactive.
JohnThomson/BloomDesktop,JohnThomson/BloomDesktop,gmartin7/myBloomFork,BloomBooks/BloomDesktop,StephenMcConnel/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,andrew-polk/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,BloomBooks/BloomDesktop,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,JohnThomson/BloomDesktop,gmartin7/myBloomFork,gmartin7/myBloomFork,gmartin7/myBloomFork,JohnThomson/BloomDesktop,BloomBooks/BloomDesktop,gmartin7/myBloomFork,andrew-polk/BloomDesktop,gmartin7/myBloomFork,JohnThomson/BloomDesktop,BloomBooks/BloomDesktop