Build, Test: Scheduler: Change pe.dot to dot.pe

All the other pe output files are in the format ".<extension>.pe", while
dot's pe output files are in the format ".pe.dot".

Also, the clean-local make target only removes based on the glob *.pe.*.
This commit updates the glob to *.pe.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>