Removed .lower() from _listener_autolev_antlr

[Sc0rpi0n101]

References to other Issues or PRs

Fixes #15166
Extends #16580

Brief description of what is fixed or changed

Removed all the .lower() functions from sympy/parsing/_listener_autolev_antlr

Other comments

Merge together with or after #16580 after that passes the build tests.

Release Notes

• parsing
  • removed .lower() function call from _listener_autolev_antlr

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• parsing
  • removed .lower() function call from _listener_autolev_antlr (#16584 by @Sc0rpi0n101)

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<!-- Your title above should be a short description of what
was changed. Do not include the issue number in the title. -->

#### References to other Issues or PRs
<!-- If this pull request fixes an issue, write "Fixes #NNNN" in that exact
format, e.g. "Fixes #1234". See
https://github.com/blog/1506-closing-issues-via-pull-requests . Please also
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Fixes #15166
Extends #16580

#### Brief description of what is fixed or changed

Removed all the .lower() functions from sympy/parsing/_listener_autolev_antlr

#### Other comments

Merge together with or after #16580  after that passes the build tests.
#### Release Notes

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https://github.com/sympy/sympy/wiki/Writing-Release-Notes for more information
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<!-- BEGIN RELEASE NOTES -->
* parsing
  * removed .lower() function call from _listener_autolev_antlr
<!-- END RELEASE NOTES -->