fix: make touch cal default suitable for 2.8 panel

Author: edy555

main.c

@@ -609,7 +609,8 @@ config_t config = {
   .menu_normal_color = 0xffff,
   .menu_active_color = 0x7777,
   .trace_color =       { RGB565(0,255,255), RGB565(255,0,40), RGB565(0,0,255), RGB565(50,255,0) },
-  .touch_cal =         { 693, 605, 124, 171 },  //{ 620, 600, 160, 190 },
+//  .touch_cal =         { 693, 605, 124, 171 },  // 2.4 inch LCD panel
+  .touch_cal =         { 338, 522, 153, 192 },  // 2.8 inch LCD panel
   .default_loadcal =   0,
   .harmonic_freq_threshold = 300000000,
   .checksum =          0