fix: patch padding for base64

[J0]

fix proposed @kn

See #246 for details

Thanks kn!

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.68%.

Quality metrics	Before	After	Change
Complexity	2.05 ⭐	2.03 ⭐	-0.02 👍
Method Length	50.12 ⭐	51.62 ⭐	1.50 👎
Working memory	4.81 ⭐	4.97 ⭐	0.16 👎
Quality	85.38% ⭐	84.70% ⭐	-0.68% 👎

Other metrics	Before	After	Change
Lines	72	75	3

Changed files	Quality Before	Quality After	Quality Change
gotrue/helpers.py	85.38% ⭐	84.70% ⭐	-0.68% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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