Disable padding in @source inline(…) brace expansion

[philipp-spiess]

Closes #17492

The padding code we had was incorrect as it would always pad on the largest string representation. So for an input like this:

@source inline("z-{10..100..10}");

It would create the following candidates:

• z-010
• z-020
• z-030
• z-040
• z-050
• z-060
• z-070
• z-060
• z-070
• z-100

Instead of fixing the padding logic we realized that Tailwind utilities don't need padding at all so this PR removes this feature

Test plan

• Added the following to the Vite playground: @source inline("z-{10..100..10}");
• Ensure it works: