[GtkUI] Fix ETA sorting to match WebUI

The sort for Ascending was putting longest eta first but seems more
intuitive that the smallest time to wait should be first. The WebUI
in previous commit swapped this behaviour so updating GtkUI.

deluge/ui/gtk3/torrentview.py

@@ -77,13 +77,13 @@ def eta_column_sort(model, iter1, iter2, data):
     if v1 == v2:
         return 0
     if v1 == 0:
-        return 1
+        return -1
     if v2 == 0:
-        return -1
-    if v1 > v2:
         return 1
-    if v2 > v1:
+    if v1 > v2:
         return -1
+    if v2 > v1:
+        return 1
 
 
 def seed_peer_column_sort(model, iter1, iter2, data):