fix(bazel): don't equate moduleName with fileName

[alexeagle]

Fixes broken material build.
/cc @jelbourn

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PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[mary-poppins]

You can preview 5a0076f at https://pr20895-5a0076f.ngbuilds.io/.

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