Use FactoryServer.sh for daemon execution (#185)

FactoryServer.sh sets up a few environment variables and provides the
path to the server binary for launching Satisfactory Dedicated server.

With the migration to UE5 imminent for the experimental channel, this
should handle changes to the game files that may include a new path to
launching the server.

run.sh

@@ -145,11 +145,11 @@ rm -rf "$GAMESAVESDIR"
 ln -sf "/config/saved" "$GAMESAVESDIR"
 cp /home/steam/*.ini "${GAMECONFIGDIR}/Config/LinuxServer/"
 
-if [ ! -f "/config/gamefiles/Engine/Binaries/Linux/UE4Server-Linux-Shipping" ]; then
-    printf "Game binary is missing.\\n"
+if [ ! -f "/config/gamefiles/FactoryServer.sh" ]; then
+    printf "FactoryServer launch script is missing.\\n"
     exit 1
 fi
 
 cd /config/gamefiles || exit 1
 
-exec ./Engine/Binaries/Linux/UE4Server-Linux-Shipping FactoryGame -log -NoSteamClient -unattended ?listen -Port="$SERVERGAMEPORT" -BeaconPort="$SERVERBEACONPORT" -ServerQueryPort="$SERVERQUERYPORT" -multihome="$SERVERIP" "$@"
+exec ./FactoryServer.sh -log -NoSteamClient -unattended ?listen -Port="$SERVERGAMEPORT" -BeaconPort="$SERVERBEACONPORT" -ServerQueryPort="$SERVERQUERYPORT" -multihome="$SERVERIP" "$@"