change the way config files are loaded

[txoof]

Currently system config and user config are loaded; when running as a user, skip the system config.

epd_display/paperpi/paperpi.py

Line 135 in c94726d

config_files_list = [constants.config_base, constants.config_system, constants.config_user]

[txoof]

paperpi -c /path/to/config always tries to load ~/.config/com.txoof.paperpi/paperpi.ini as well as the specified

[txoof]

commit 3537d18#diff-9ce0ecb5babcaeff99522b4ea3fad1b00cd6a8b4a2f5f5b64d102f0643da5454 resolves