editor: fixed editor having two hex overlays drawing over each other

images/editor/brush.png and images/misc/hover-hex.png were being drawn
on top of each other, resulting in an unsightly editor brush. Removed the
latter.

src/editor/editor_display.cpp

@@ -122,10 +122,6 @@ void editor_display::draw_hex(const map_location& loc)
 			drawing_buffer_add(LAYER_SELECTED_HEX, loc, xpos, ypos,
 					image::get_texture(brush, image::SCALED_TO_HEX));
 		}
-		if (map().on_board(loc) && loc == mouseoverHex_) {
-			drawing_buffer_add(LAYER_MOUSEOVER_BOTTOM, loc, xpos, ypos,
-					image::get_texture("misc/hover-hex.png", image::SCALED_TO_HEX));
-		}
 #else
 		if (map().in_selection(loc)) {
 			drawing_buffer_add(LAYER_FOG_SHROUD, loc, xpos, ypos,
@@ -137,10 +133,6 @@ void editor_display::draw_hex(const map_location& loc)
 			drawing_buffer_add(LAYER_SELECTED_HEX, loc, xpos, ypos,
 					image::get_image(brush, image::SCALED_TO_HEX));
 		}
-		if (map().on_board(loc) && loc == mouseoverHex_) {
-			drawing_buffer_add(LAYER_MOUSEOVER_BOTTOM, loc, xpos, ypos,
-					image::get_image("misc/hover-hex.png", image::SCALED_TO_HEX));
-		}
 #endif
 	}
 }