`bridge` is used by iproute2, so using this name for protonmail-bridge
made it very likely to produce a name "conflict".
Also `bridge` is used in the Makefile by upstream project Makefile but
it apparently is renamed later on when packaged in rpm/deb so even for
coherence purposes it does make sense to revert it back to the name
`protonmail-bridge` that were previously being used.
Signed-off-by: Arthur Outhenin-Chalandre <arthur.outhenin-chalandre@proton.ch>
c492acd865