perf: tweak some search queries

We currently sorting on two columns in different tables which is quite
expensive in terms of performance:
MariaDB is first merging the data into some temporary table to apply the
sorting and record limiting.

We can tweak a couple of these queries by changing the "order by" clause
such that they refer to columns within the same table (PackageBases).
So instead performing the second sorting on "Packages.Name", we do
this on "PackageBases.Name" instead.
This should still be "good enough" to produce properly sorted results.

Signed-off-by: moson-mo <mo-son@mailbox.org>

aurweb/packages/search.py

@@ -195,13 +195,13 @@ class PackageSearch:
 
     def _sort_by_votes(self, order: str):
         column = getattr(models.PackageBase.NumVotes, order)
-        name = getattr(models.Package.Name, order)
+        name = getattr(models.PackageBase.Name, order)
         self.query = self.query.order_by(column(), name())
         return self
 
     def _sort_by_popularity(self, order: str):
         column = getattr(models.PackageBase.Popularity, order)
-        name = getattr(models.Package.Name, order)
+        name = getattr(models.PackageBase.Name, order)
         self.query = self.query.order_by(column(), name())
         return self
 
@@ -236,7 +236,7 @@ class PackageSearch:
 
     def _sort_by_last_modified(self, order: str):
         column = getattr(models.PackageBase.ModifiedTS, order)
-        name = getattr(models.Package.Name, order)
+        name = getattr(models.PackageBase.Name, order)
         self.query = self.query.order_by(column(), name())
         return self