agent: Fix edit bar's background color when zoomed in (#34163)

When the panel was zoomed in, the edit bar's background color would have
a different color than the rest of the panel. This PR fixes it by using
the `panel_background` color token.

Release Notes:

- N/A

assets/icons/tool_diagnostics.svg

@@ -1,5 +1,5 @@
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assets/icons/tool_read.svg

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+</svg>

assets/icons/tool_web.svg

@@ -1,17 +1,5 @@
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