change executable to use included start script

better to use it as it's included with the server & sets some environment info

Squad/squadserver

@@ -100,8 +100,8 @@ filesdir="${rootdir}/serverfiles"
 
 ## Server Specific Directories
 systemdir="${filesdir}/Squad"
-executabledir="${systemdir}/Binaries/Linux"
-executable="./SquadServer"
+executabledir="${systemdir}"
+executable="./SquadServer.sh"
 servercfgdir="${systemdir}/ServerConfig"
 servercfg="Server.cfg"
 servercfgdefault="Server.cfg"