Fix time snap of sliders not matching when SV is not 1.0x

This regressed with https://github.com/ppy/osu/pull/20850 because the
function was used in other places which expect it to factor slider
velocity into the equation.

Rather than reverting, I've added a new argument, as based on the method
naming alone it was hard to discern whether SV should actually be
considered.

The reason for the change in #20850 was to avoid the SV coming in from a
reference object which may not have a correct SV in the first place. In
such cases, passing `false` to the function will give the expected
behaviour.

osu.Game/Screens/Edit/Compose/Components/DistanceSnapGrid.cs

@@ -97,7 +97,7 @@ namespace osu.Game.Screens.Edit.Compose.Components
         private void updateSpacing()
         {
             float distanceSpacingMultiplier = (float)DistanceSpacingMultiplier.Value;
-            float beatSnapDistance = SnapProvider.GetBeatSnapDistanceAt(ReferenceObject);
+            float beatSnapDistance = SnapProvider.GetBeatSnapDistanceAt(ReferenceObject, false);
 
             DistanceBetweenTicks = beatSnapDistance * distanceSpacingMultiplier;