epsonds: Allow querying OPT_ADF_CRP

The OPT_ADF_CRP (adf-crp) option is detectable from the hardware and is
settable as an option, but can't be queried.  This appears to just be an
oversight, so add it to the list of handled options.

backend/epsonds.c

@@ -2263,6 +2263,7 @@ getvalue(SANE_Handle handle, SANE_Int option, void *value)
 	case OPT_BR_Y:
 	case OPT_DEPTH:
 	case OPT_ADF_SKEW:
+	case OPT_ADF_CRP:
 		*((SANE_Word *) value) = sval->w;
 		break;