Remove docstring and getopt short options for deleted option "python -m base64 -t"

[ppmfloss]

The -t option for base64 python -m base64 -t is removed in the PR #94230

But some references still exist in the docstring and getopt short options. Because of this we can still run the following command
without getting any error

python -m base64 -t /dev/null

Linked PRs

• GH-102456 Fix docstring and getopt options for base64 #102457
• [3.11] GH-102456 Fix docstring and getopt options for base64 #103183
• [3.11] GH-102456 Fix docstring and getopt options for base64 #103184