Drop magick probe from GTK Meson build

.github/workflows/flatpak-build.yml

@@ -25,15 +25,6 @@ jobs:
         with:
           submodules: true
 
-      - name: Install ImageMagick
-        run: |
-          apt-get update
-          apt-get install -y --no-install-recommends imagemagick
-          if ! command -v magick >/dev/null 2>&1 && command -v convert >/dev/null 2>&1; then
-            printf '%s\n' '#!/bin/sh' 'exec convert "$@"' > /usr/local/bin/magick
-            chmod +x /usr/local/bin/magick
-          fi
-
       - name: Build Flatpak
         id: flatpak_builder
         uses: flatpak/flatpak-github-actions/flatpak-builder@v6