[FIXED JENKINS-24340] - Do not disable jobs if supportsMakeDisabled() returns false

This changes prevents the improper usage of method without the preliminary supportsMakeDisabled() check.
As an example, Subversion plugin behaves in such way (JENKINS-24341)

Signed-off-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Merge pull request #1374 from synopsys-arc-oss/JENKINS-24340

[FIXED JENKINS-24340] - Do not disable jobs if supportsMakeDisabled() returns false