library: make the pids_sort_order enums more intuitive

The values of PROCPS_SORT_ASCEND & PROCPS_SORT_DESCEND
were a tad unintuitive. This patch will just make them
a more natural +1 for ascending and -1 for descending.

[ plus it still allows that fast path multiplication ]
[ instead of a comparison for signed numbers/strings ]

Signed-off-by: Jim Warner <james.warner@comcast.net>

proc/pids.h

@@ -150,8 +150,8 @@ enum pids_reap_type {
 };
 
 enum pids_sort_order {
-    PROCPS_SORT_ASCEND   = -1,
-    PROCPS_SORT_DESCEND  = +1
+    PROCPS_SORT_ASCEND   = +1,
+    PROCPS_SORT_DESCEND  = -1
 };