test: make sample title unique (#949)

test/data/test_grace_note_fingerings_and_strings_Ysaye_excerpt.musicxml

@@ -2,7 +2,7 @@
 <!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 3.1 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
 <score-partwise version="3.1">
   <work>
-    <work-title>Test - Grace Note Fingerings (Ysaye Ballade)</work-title>
+    <work-title>Test - Grace Note Fingerings and String Number</work-title>
     </work>
   <identification>
     <creator type="composer">Eugene Ysaye</creator>