Switch from Water change directly to Feed mode

Makes it possible to change mode directly from Water change to Feed mode over wifi. Sometimes I might do the feeding of anemones, riccordeas etc in Water change mode because on that mode the power heads are always of. After the actual feeding I would like to change to Feeding mode on the RA so the power heads are set to low flow for a couple of minutes before going back to normal mode.

Prior to this fix it can only be done by exiting Water change mode and then quickly enter Feed mode.