Fix emoji popup shadows

While adapting the emoji picker from NeoChat, I noticed that the shadows are missing from the emoji picker, so here's a simple fix to show them again.

• qqc2-desktop-style or someone else puts clip: true into Popups for us, sigh. Now it's explicitly set to false so it doesn't gobble up the shadow.
• The shadows are slightly tweaked and bumped up a notch (mostly to get over the border) so they look like other popups.
• The same changes are applied to the tone picker too,

Before

After