Fix collab indicator colors (#2854)

[[PR Description]]

Release Notes:

- N/A

or

- (Added|Fixed|Improved) ...
([#<public_issue_number_if_exists>](https://github.com/zed-industries/community/issues/<public_issue_number_if_exists>)).

If the release notes are only intended for a specific release channel
only, add `(<release_channel>-only)` to the end of the release note
line.
These will be removed by the person making the release.

styles/src/component/indicator.ts

@@ -1,9 +1,9 @@
-import { background } from "../style_tree/components"
+import { foreground } from "../style_tree/components"
 import { Layer, StyleSets } from "../theme"
 
 export const indicator = ({ layer, color }: { layer: Layer, color: StyleSets }) => ({
     corner_radius: 4,
     padding: 4,
     margin: { top: 12, left: 12 },
-    background: background(layer, color),
+    background: foreground(layer, color),
 })

styles/src/style_tree/collab_panel.ts

@@ -8,7 +8,6 @@ import {
 import { interactive, toggleable } from "../element"
 import { useTheme } from "../theme"
 import collab_modals from "./collab_modals"
-import { text_button } from "../component/text_button"
 import { icon_button, toggleable_icon_button } from "../component/icon_button"
 import { indicator } from "../component/indicator"