chat: update blocks-ci screenshot baseline for the compact add glyph

Switching Add Context to `Codicon.addCompact` changes the `+` in the
inline chat zone widget, which is a blocks-ci fixture.

Verified the change is intentional and confined before accepting the new
hashes: rendering the fixture on this branch and on its merge-base and
diffing them locally shows a single 12×12px region differing — the `+`
glyph going from 11×11 to 10×10 of ink. That is the optically tuned
compact glyph replacing the scaled-down base one, at a call site already
rendering at `codiconFontSize-compact`, which is the pairing the design
tokens guidance asks for. Nothing else in the widget moved.

Hashes are exactly the ones the failing run computed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

test/componentFixtures/blocks-ci-screenshots.md

@@ -19,10 +19,10 @@
 ![screenshot](https://hediet-screenshots.azurewebsites.net/images/62651503e0db22d7800352a848d4c6db4cdc56499fa40d5eac681958e9aea19a)
 
 #### editor/inlineChatZoneWidget/InlineChatZoneWidget/Dark
-![screenshot](https://hediet-screenshots.azurewebsites.net/images/2401c41f5ef5e73d2e076f82c28462bdb80affcf3a7c088b903685a1cda7247d)
+![screenshot](https://hediet-screenshots.azurewebsites.net/images/7700bb9cad18d064af94493b4ae0a4f75e3c855df7ba4eb1d8a4a562eaa41dc6)
 
 #### editor/inlineChatZoneWidget/InlineChatZoneWidget/Light
-![screenshot](https://hediet-screenshots.azurewebsites.net/images/47716cdd8c034534ed13b7bc7717e2abe55d78d4e716b415d606a174dfeee70e)
+![screenshot](https://hediet-screenshots.azurewebsites.net/images/7f3cd7b0e664da973a1bb4c80f5d22005261f2eee798ffee0d3d95b48bf431b3)
 
 #### editor/inlineChatZoneWidget/InlineChatZoneWidgetTerminated/Dark
 ![screenshot](https://hediet-screenshots.azurewebsites.net/images/0752cf02ae3a4e21fce84b62859df32a5f41c13622bdec0083a3fd46832c2e0a)