Allow project-find-regexp'ing inside an ignored dir

* lisp/progmodes/project.el (project-find-regexp): Don't pass
project's ignores to project--files-in-directory.  The FILES glob
should be enough, and we don't want to prohibit searching inside
ignored directories this way (it can be counter-intuitive).
1 job for master in 49 minutes and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #1622
test-all

00:49:49

 
Name Stage Failure
failed
test-all Test
Makefile:315: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:290: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:963: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1