Remove lread tests for a feature that was deleted

* test/src/lread-tests.el (lread-tests--old-style-backquotes)
(lread-tests--force-new-style-backquotes): Remove.
1 job for master in 59 minutes and 40 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #5006
test-all

00:59:40

 
Name Stage Failure
failed
test-all Test
Makefile:319: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:294: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
make: *** [check-expensive] Error 2
Makefile:959: recipe for target 'check-expensive' failed
ERROR: Job failed: exit code 1