dll: Sort dll.conf.in for ease of maintenance

Only the `net` backend is treated special to match the file comment.

backend/dll.conf.in

@@ -11,10 +11,10 @@ net
 abaton
 agfafocus
 apple
-avision
 artec
 artec_eplus48u
 as6e
+avision
 bh
 canon
 canon630u
@@ -24,9 +24,9 @@ cardscan
 coolscan
 #coolscan2
 coolscan3
-#dc25
 #dc210
 #dc240
+#dc25
 dell1600n_net
 dmc
 epjitsu
@@ -35,17 +35,17 @@ epson2
 epsonds
 escl
 fujitsu
-#gphoto2
 genesys
+#gphoto2
 gt68xx
 hp
-hp3900
-hpsj5s
 hp3500
+hp3900
 hp4200
 hp5400
 hp5590
 hpljm1005
+hpsj5s
 hs2p
 ibm
 kodak
@@ -94,7 +94,7 @@ teco3
 #test
 u12
 umax
-#umax_pp
 umax1220u
+#umax_pp
 v4l
 xerox_mfp