fix show commit version on UI

lnbits/app.py

@@ -108,6 +108,7 @@ def register_assets(app: QuartTrio):
 def register_filters(app: QuartTrio):
     """Jinja filters."""
     app.jinja_env.globals["SITE_TITLE"] = app.config["LNBITS_SITE_TITLE"]
+    app.jinja_env.globals["LNBITS_VERSION"] = app.config["LNBITS_COMMIT"]
     app.jinja_env.globals["EXTENSIONS"] = get_valid_extensions()