Fixed error on trying to send ws message to disconnected client

This could result in a major filament usage track failure since the Use http request would fail and Moonraker would keep retrying to save the used filament. However it was actually saved since the db.commit() happens before the websocket message fails.

spoolman/database/vendor.py

@@ -33,8 +33,8 @@ async def create(
         extra=[models.VendorField(key=k, value=v) for k, v in (extra or {}).items()],
     )
     db.add(vendor)
-    await db.commit()
     await vendor_changed(vendor, EventType.ADDED)
+    await db.commit()
     return vendor
 
 
@@ -101,8 +101,8 @@ async def update(
             vendor.extra = [models.VendorField(key=k, value=v) for k, v in v.items()]
         else:
             setattr(vendor, k, v)
-    await db.commit()
     await vendor_changed(vendor, EventType.UPDATED)
+    await db.commit()
     return vendor