Fix: ctx.set_fonts() Doesn't Apply Fonts with Same Name

[rustbasic]

If a font file named my_font is set using ctx.set_fonts() and then another font file with the same name is set again using ctx.set_fonts(), it won't be applied.

1. Additionally, it's recommended to apply fonts immediately using ctx.set_fonts().
2. This will also allow you to reset the fonts and texture.

• Related Automatically load system fonts when needed #5233
• Closes ctx.set_fonts() Doesn't Apply Fonts with Same Name #5252

[github-actions]

Preview available at https://egui-pr-preview.github.io/pr/5253-patch137
Note that it might take a couple seconds for the update to show up after the preview_build workflow has completed.

[emilk]

Let's wait until after #5228 is merged