[X7] fix #5911 and bmp loading (#6703)

* lcdDraw1bitBitmap now bit exact

* bmp rows are padded up to a multiple of 4 bytes

radio/src/lua/api_lcd.cpp

@@ -541,7 +541,7 @@ Draw a bitmap at (x,y)
 
 @param name (string) full path to the bitmap on SD card (i.e. “/IMAGES/test.bmp”)
 
-@notice Only available on Taranis X9 series. Maximum image size if 106 x 64 pixels (width x height).
+@notice Maximum image size is [display width / 2] x [display height] pixels.
 
 @status current Introduced in 2.0.0
 */