test/filessystem: minor cleanups

Remove incorrect comment (not an ostree image).
Add a greenprint for depsolving since it can take some time for that to
run and it makes more sense than pausing output on "Preparing
blueprint".

test/cases/filesystem.sh

@@ -42,7 +42,6 @@ trap cleanup_on_exit EXIT
 OSBUILD_LABEL=$(matchpathcon -n "$(which osbuild)")
 sudo chcon "$OSBUILD_LABEL" /usr/libexec/osbuild-composer-test/image-info
 
-# Build ostree image.
 build_image() {
     blueprint_file=$1
     blueprint_name=$2
@@ -52,6 +51,7 @@ build_image() {
     # Prepare the blueprint for the compose.
     greenprint "📋 Preparing blueprint"
     sudo composer-cli blueprints push "$blueprint_file"
+    greenprint "📋 Depsolving blueprint"
     sudo composer-cli blueprints depsolve "$blueprint_name"
 
     # Get worker unit file so we can watch the journal.