Tracker: Filter out 0 capacity volumes from Targets.

This includes the "config" and "system" pseudo-volumes.

Change-Id: I3e1f19e1926dc45b801e38dbe5cdf34700addea5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9742
Reviewed-by: nephele nephele <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

src/kits/tracker/FindPanel.cpp

@@ -2482,7 +2482,7 @@ FindPanel::AddVolumes()
 	BVolume volume;
 	roster.Rewind();
 	while (roster.GetNextVolume(&volume) == B_OK) {
-		if (volume.IsPersistent() && volume.KnowsQuery()) {
+		if (volume.IsPersistent() && volume.Capacity() > 0 && volume.KnowsQuery()) {
 			BDirectory root;
 			if (volume.GetRootDirectory(&root) != B_OK)
 				continue;