brush.c: reindent Draw_paintbrush()

src/brush.c

@@ -329,7 +329,7 @@ void Draw_paintbrush(short x,short y,byte color)
         }
       } else {
         int prev_x;
-		// Raster mode
+        // Raster mode IMAGE_MODE_RASTER
         // No matter what, you can always edit only 1 line at a time here, and you will always
         // draw on "nops" boundaries (8 pixels in mode 1)
         height=1;