remove another dublicate test case

src/drawing.rs

@@ -133,12 +133,6 @@ mod tests {
     use embedded_graphics::coord::Coord;
     use embedded_graphics::primitives::Line;
 
-    #[test]
-    fn from_u8() {
-        assert_eq!(Color::Black, Color::from(0u8));
-        assert_eq!(Color::White, Color::from(1u8));
-    }
-
     #[test]
     fn rotation_overflow() {
         use epd4in2::constants::{WIDTH, HEIGHT};
@@ -165,8 +159,6 @@ mod tests {
         }
     }
 
-
-
     // test buffer length
     #[test]
     fn graphics_4in2_size() {