shared: qssquery: Fix sqlerror if sort condition comes last

If we had something like c:(test) sort:(mtime, desc), then
we would run into an sql error eventually, since we
would have added an implicit AND token before the sort
condition. This is wrong, as a sort is not a filter.

So, as a quick hack to fix this, just remove a preceeding
boolean (as dirty as it may be, but it does the job for now).

shared/qssquery.cpp

@@ -276,6 +276,11 @@ QSSQuery QSSQuery::build(QString expression)
 				{
 					throw QSSGeneralException("Two sort statements are illegal");
 				}
+				// TODO: hack, since we are not a "filter", we must remove a preceeding (implicit) boolean
+				if(result.tokens.last().type & BOOL == BOOL)
+				{
+					result.tokens.pop_back();
+				}
 				result.sortConditions = createSortConditions(value);
 				continue;
 			}