Improve track search performance

Searching for a track was wrapping the search string in % signs
(wildcards). The leading % meant the database didn't use the index.
Dropped leading % (user can add it manually if needed).

app/models.py

@@ -731,7 +731,7 @@ class Tracks(Base):
         return (
             session.execute(
                 select(cls)
-                .where(cls.title.ilike(f"%{text}%"))
+                .where(cls.title.like(f"{text}%"))
                 .order_by(cls.title)
             )
             .scalars()

app/musicmuster.py

@@ -1837,7 +1837,7 @@ class DbDialog(QDialog):
         """Handle text typed in search box"""
 
         self.ui.matchList.clear()
-        if len(s) > 1:
+        if len(s) > 0:
             if self.ui.radioTitle.isChecked():
                 matches = Tracks.search_titles(self.session, s)
             else: