Fix crash when using remote docker instance (#169)

When trying to compare / sync and where the remote host is based on Docker, an error will be displayed as per below:
invalid argument "pihole1" for "-f, --filter" flag: bad format of filter (expected name=value)
See 'docker ps --help'.

includes/gs-core.sh

@@ -102,7 +102,7 @@ function ph_type {
         RH_EXEC="${RIHOLE_BIN}"
     elif [ "$RH_IN_TYPE" == "docker" ]
     then
-        RH_EXEC="sudo ${ROCKER_BIN} exec $(sudo ${ROCKER_BIN} ps -qf ${ROCKER_CON}) pihole"
+        RH_EXEC="sudo ${ROCKER_BIN} exec $(sudo ${ROCKER_BIN} ps -qf name=${ROCKER_CON}) pihole"
     elif [ "$RH_IN_TYPE" == "podman" ]
     then
         RH_EXEC="sudo ${RODMAN_BIN} exec ${ROCKER_CON} pihole"
@@ -143,4 +143,4 @@ function start_gs_noconfig {
 
     MESSAGE="Evaluating Arguments"
     echo_stat
-}
+}