systemd: remove double braces

Previously these unit files were processed by pythons format() method,
so the double braces would be reduced to a single brace.

The unit files are no longer processed so the double braces are not
removed and break starting of the unit.

Tested:
From systemctl status phosphor-gpio-presence@0.service:

`-398 /usr/bin/phosphor-gpio-presence --path=/dev/input/by-path/platform-gpio-keys-event --inventory=/system/chassis/motherboard/powersupply0 --key=104 --name=powersupply0 --drivers=/sys/bus/i2c/drivers/ibm-cffps,3-0069 --extra-ifaces=xyz.openbmc_project.Inventory.Item.PowerSupply

Nov 01 19:28:33 witherspoon-Y230UF71K03T systemd[1]: Started Phosphor GPIO 0 Presence.
Nov 01 19:28:34 witherspoon-Y230UF71K03T phosphor-gpio-presence[398]: Updating inventory present property

Change-Id: Iacb29c8524152f87c676fd70227b076a6c84b877
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
2 files changed