Fix broken CI

CI has been broken because the build matrix for Desktop did not set UseFabric for most configs, which is used to set the artifactName parameter to the publish-build-artifacts template. Changed from if x == true, if x == false to if x == true, else.

Author: jonthysell

.ado/jobs/desktop.yml

@@ -204,7 +204,7 @@ jobs:
               parameters:
                 ${{ if eq(matrix.UseFabric, true) }}:
                   artifactName: DesktopFabric
-                ${{ if eq(matrix.UseFabric, false) }}:
+                ${{ else }}:
                   artifactName: Desktop
                 buildPlatform: ${{ matrix.BuildPlatform }}
                 buildConfiguration: ${{ matrix.BuildConfiguration }}