It's not clear which Grid Stretch mode in blend space is currently on

In a blend space or aim offset, there's no clear indication which grid stretch mode is enabled when clicking the button in the grid (aside from looking at the tooltip when hovering over the button).

It would be good to have some visual confirmation that a certain mode is toggled (maybe the icon changes or is highlighted).

1. Open QAGame in editor.
2. Open TEST_Blend2D in Persona.
3. Click the Fit Grid button in the graph.

RESULT:

There's no indication that the Grid Fitting mode has changed, aside from the tooltip.

EXPECTED:

Some clear visual update to let the user node that the grid will behave differently when scaling the panel (button is "toggled on" or highlighted, or the icon changes).