fix build on newer egui

src/misc.rs

@@ -1,4 +1,4 @@
-use base64::{engine::general_purpose, Engine as _};
+use base64::{Engine as _, engine::general_purpose};
 use egui_plot::{Line, PlotPoint, PlotPoints, Points};
 use emath::Pos2;
 use getrandom::getrandom;