sample_set_list.py fix next page button

Due to a length check in the wrong place, the button for incrementing
the page number was not appearing

server/web2py/applications/vidjil/models/sample_set_list.py

@@ -18,8 +18,7 @@ class SampleSetList():
         auth.load_permissions(PermissionEnum.admin.value, type)
         auth.load_permissions(PermissionEnum.anon.value, type)
         self.elements = {}
-        for i in range(0, min(len(query_gss), step)):
-            row = query_gss[i]
+        for row in query_gss:
             self.elements[row.id] = row
             self.elements[row.id].file_count = 0
             self.elements[row.id].size = 0