[FIXED JENKINS-24703] Do not set any colors for input elements
Merge pull request #1423 from tfennelly/JENKINS-24703

[FIXED JENKINS-24703] Do not set any colors for input elements
[FIXED JENKINS-25065 JENKINS-24987]

Based on the reaction to these issues and JENKINS-24514, I'm partially
reverting the original change, and bringing the umask default back to
022.

The configurable option does enable the user to choose a different
umask, so I think I can still claim that JENKINS-24514 is addressed.