Fix renamed module references

Change .data_ammonia_new to .data_ammonia in:

  - doc/material/index
  - pyproject.toml

Author: macflo8

doc/material/index.rst

@@ -52,7 +52,7 @@ They can be turned on and off individually under ``DATA_FUNCTIONS`` in :mod:`__i
 .. automodule:: message_ix_models.model.material.data_generic
   :members:
 
-.. automodule:: message_ix_models.model.material.data_ammonia_new
+.. automodule:: message_ix_models.model.material.data_ammonia
   :members:
 
 .. automodule:: message_ix_models.model.material.data_methanol

pyproject.toml

@@ -120,7 +120,7 @@ files = [
 module = [
   # TODO Satisfy mypy in the following
   "message_ix_models.model.material.build",
-  "message_ix_models.model.material.data_ammonia_new",
+  "message_ix_models.model.material.data_ammonia",
   "message_ix_models.model.material.data_generic",
   "message_ix_models.model.material.data_petro",
   "message_ix_models.model.material.data_steel",