freetype: fix first backgrounds alignment

fixes the second line background alignment which is always wrong.

modules/text_renderer/freetype.c

@@ -729,7 +729,7 @@ static inline void RenderBackground( subpicture_region_t *p_region,
         ExtractComponents( 0x000000, &i_x, &i_y, &i_z );
 
         /* Compute the upper boundary for the background */
-        if ((i_align_top + p_line->i_base_line - max_height) < 0)
+        if ((i_align_top + p_line->i_base_line - max_height) < 0 || p_line->i_base_line <= p_line->i_height)
             line_top = i_align_top + p_line->i_base_line;
         else
             line_top = i_align_top + p_line->i_base_line - max_height;