Update relative path in manifest.json to match it's new location

[jnises]

I'm not sure if this matters at all. But it seems like the correct way to do things?

[emilk]

@Its-Just-Nans recently changed this

[Its-Just-Nans]

@jnises it's here

• https://github.com/emilk/eframe_template/pull/146

for information ^^