fix(arma3): fix binary name (#3205)

lgsm/config-default/config-lgsm/arma3server/_default.cfg

@@ -173,7 +173,7 @@ glibc="2.13"
 ## Game Server Directories
 systemdir="${serverfiles}"
 executabledir="${serverfiles}"
-executable="./arma3server_64"
+executable="./arma3server_x64"
 servercfgdir="${systemdir}/cfg"
 servercfg="${selfname}.server.cfg"
 servercfgdefault="server.cfg"