adb: Android serial numbers are not all 16 characters long, so accept other lengths.

I can't find any documentation of how long it should be. Hard to imagine
it being shorter than 4 characters though, so put that in as a conservative
lower bound.

This commit was sponsored by Nick Piper on Patreon.

Remote/Adb.hs

@@ -236,7 +236,7 @@ enumerateAdbConnected =
   where
 	parse l = 
 		let (serial, desc) = separate (== '\t') l
-		in if null desc || length serial /= 16
+		in if null desc || length serial < 4
 			then Nothing 
 			else Just (AndroidSerial serial)