More API fixes

- Allow searching supplier parts by manufacturer name
- Better rendering of supplier part table

(cherry picked from commit 62199aedf5)

InvenTree/company/api.py

@@ -130,7 +130,7 @@ class SupplierPartList(generics.ListCreateAPIView):
     search_fields = [
         'SKU',
         'supplier__name',
-        'manufacturer_name',
+        'manufacturer__name',
         'description',
         'MPN',
     ]