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.

Additionally, it's recommended to apply fonts immediately using ctx.set_fonts().

• Related #5233
• Closes #5252

[github-actions[bot]]

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 https://github.com/emilk/egui/pull/5228 is merged

[emilk]

Needs to fix merge conflict now that https://github.com/emilk/egui/pull/5228 is merged