Remove the forge "unfocused-border" patch

The patch rewrote forge's window.js with `sed`/`awk` anchored on
exact upstream lines, making it the most fragile piece of the
repository, for a purely cosmetic hairline on unfocused windows.

This also simplifies a future migration away from forge.

.config/gnome-settings/README.md

@@ -32,8 +32,6 @@ Process:
 4. Patch a broken backup path in the installed `forge` extension (`theme.js`)
 5. Ensure the enabled GNOME extensions' schemas are imported
 6. Load every `*.ini` here, then every `local/*.ini`
-7. Apply a small [patch](../../.local/bin/gnome-shell-extension-forge-patch)
-   to the `forge` extension to draw borders on unfocused windows
 
 [`dconf-load`](../../.local/bin/dconf-load) captures step 6 as an independent utility,
     or for just one file given as an argument,