Remove more or less duplicate test cases for 2in9 buffer

src/epd1in54/graphics.rs

@@ -12,7 +12,7 @@ impl Default for Buffer1in54BlackWhite {
                 WIDTH as usize * HEIGHT as usize / 8                
             ]
         }
-    }
+    }    
 }
 
 

src/epd1in54/mod.rs

@@ -19,10 +19,10 @@
 //! epd4in2.sleep();
 //! ```
 
-const WIDTH: u32 = 200;
-const HEIGHT: u32 = 200;
+pub const WIDTH: u32 = 200;
+pub const HEIGHT: u32 = 200;
 //const DPI: u16 = 184;
-const DEFAULT_BACKGROUND_COLOR: Color = Color::White;
+pub const DEFAULT_BACKGROUND_COLOR: Color = Color::White;
 
 use hal::{
     blocking::{delay::*, spi::Write},