Git patch in Cargo.toml still uses master instead of main

[azerupi]

In the Cargo.toml there are these lines:

https://github.com/emilk/eframe_template/blob/110ac559db398e29e1790cb3797e6f10a0651d39/Cargo.toml#L47-L49

But it looks like both egui and eframe have renamed those to main.