Fix crash when rendering quote images with multiline author

[cfazilleau]

Summary

The /quote command crashed with ValueError: can't measure length of multiline text whenever a quote's author contained a newline character.

PIL's draw.textlength() refuses any string containing \n. In quote_image.py, the author line was built directly from the stored author value (f'— {author}'). A stored author can contain newlines (Discord display names allow them, and older stored quotes may carry them), which produced a multiline string and crashed get_text_length() → draw.textlength(), taking down the whole command.

Changes

• Hardened get_text_length() to measure each line and return the widest, so it can never crash on multiline input regardless of source (quote or author).
• Normalized the author to a single line by collapsing embedded newlines/whitespace, so it renders and centers cleanly at the bottom of the image.

Testing

• Verified the file compiles with python -m py_compile cogs/quotes/quote_image.py.

Traceback (before fix)

File "/app/cogs/quotes/quote_image.py", line 78, in _render
    ax = int((IMG_W - get_text_length(draw, author_str, font_author)) // 2)
File "/app/cogs/quotes/quote_image.py", line 19, in get_text_length
    return draw.textlength(clean_text, font=font)
ValueError: can't measure length of multiline text

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