The Emacs mode doesn't handle -module attributes without parentheses

[RaimoNiskanen]

Is your feature request related to a problem? Please describe.

When/if #9502 is fixed, the Emacs mode also needs fixing.

Today, if you write:

-module(foo).

and the file is not named "foo.erl" the Emacs mode objects and wants to change the source code -module(). attribute to match the file name.

But if we write:

-module foo.

the Emacs mode doesn't check the attribute value when saving the file.

Describe the solution you'd like

The Emacs mode should be aware of -module attributes both with and without parentheses.