Fix extension navigation (#2236)

* fix: avoid `path` clash with other routes (`/withdraw` in this case)

* fix: refresh user state after extension action

* chore: fix `mypy`

lnbits/core/templates/core/extensions.html

@@ -185,7 +185,7 @@
               flat
               color="primary"
               type="a"
-              :href="extension.id"
+              :href="extension.id + '/'"
               >{%raw%}{{ $t('open') }}{%endraw%}</q-btn
             >
             <q-btn

lnbits/core/views/generic.py

@@ -167,6 +167,9 @@ async def extensions_install(
             )
         )
 
+        # refresh user state. Eg: enabled extensions.
+        user = await get_user(user.id) or user
+
         return template_renderer().TemplateResponse(
             "core/extensions.html",
             {