systemd service file: Stop using deprecated '-e' option

In commit 6d8884de490d09902e9e31a90bab9ef490ef5d82 in 2014, we
made the '-e' command line option deprecated.  Stop using it from the
systemd srevice file.

Change-Id: I322cadbee8980b78fff2984765c4b0216c50412e
Related: SYS#2749
1 file changed