anki: fix UI scale configuration

Use `numbers.between 1.0 2.0` for the UI scale type to match Anki's
actual behavior where ProfileManager.uiScale clamps values below 1.0
to 1.0.

docs/release-notes/rl-2605.md

@@ -7,6 +7,10 @@ section is therefore not final.
 
 This release has the following notable changes:
 
+- The [](#opt-programs.anki.uiScale) option now expects a value in the
+  range 1.0–2.0, previously it erroneously expected values in the
+  range `0.0–1.0`.
+
 ## State Version Changes {#sec-release-26.05-state-version-changes}
 
 The state version in this release includes the changes below. These
@@ -18,4 +22,3 @@ changes are only active if the `home.stateVersion` option is set to
 
 - The `programs.zsh.dotDir` option now defaults to the XDG configuration
   directory (usually `~/.config/zsh`) when `xdg.enable` is true.
-