chore: fix bootc label colouring on dark / light mode (#1285)

### What does this PR do?

Fixes the colour showing in dark / light mode on the image page. As
before it was not picking up the tailwind-specific colour.

### Screenshot / video of UI

<!-- If this PR is changing UI, please include
screenshots or screencasts showing the difference -->

### What issues does this PR fix or reference?

<!-- Include any related issues from Podman Desktop
repository (or from another issue tracker). -->

Closes #1174

### How to test this PR?

<!-- Please explain steps to reproduce -->

1.Pull a bootc test image
2. See that the label shows now

Signed-off-by: Charlie Drage <[email protected]>

packages/backend/package.json

@@ -76,8 +76,8 @@
           "badge": {
             "label": "bootc",
             "color": {
-              "dark": "bg-sky-300",
-              "light": "bg-sky-300"
+              "dark": "#7dd3fc",
+              "light": "#7dd3fc"
             }
           }
         }