Imbalanced spacing in marker chart stack radio button row

[mstange]

There's not enough space after "Filter stacks:", or too much space before each radio button label.

We don't have a "Filter stacks:" label in the call tree or the flame graph tab. Maybe we can remove it on the marker chart as well?

[julienw]

I added this label because I felt like that in the marker chart and table, we were lacking context for these radio buttons, so I quite strongly prefer to keep it.
But I agree that the space could be tweaked :-)