ci: Uninstall NSIS 3 properly.

Author: jcsteh

.github/workflows/build.yml

@@ -52,7 +52,7 @@ jobs:
         if: ${{ matrix.os == 'windows-latest' }}
         # Use NSIS 2.46 to reduce AV false positives.
         run: |
-          choco uninstall -y nsis
+          choco uninstall -yx nsis.install
           choco install -y nsis-unicode
       - name: Mac setup
         if: ${{ matrix.os == 'macos-latest' }}