fix: Double check if events are the same when doing indexOf

This is basically copy-pasted from SongNoteDataArrayTools lol

Author: NotHyper-474

source/funkin/util/tools/SongEventDataArrayTools.hx

@@ -46,11 +46,16 @@ class SongEventDataArrayTools
         // Search the lower half of the range.
         highIndex = midIndex - 1;
       }
-      else
+      // Found it? Make a more thorough check.
+      else if (midNote == note)
       {
-        // Found it!
         return midIndex;
       }
+      else
+      {
+        // We may be close, so constrain the range (but only a little) and try again.
+        highIndex -= 1;
+      }
     }
     return -1;
   }