MainUI patches: Enable button sound for L1/R1 and patch shutdown call

[tGecko]

This is only tested on MM+, someone please test on MM!

Patch 1

Patched MainUI binaries to play no sound on L1 and R1 keypress.
Instead play sound on L2 and R2, which are now used for scrolling.

To test:

• Open game list
• Press L2/R2
• List should scroll and button sound should play
• Press L1/R1
• no sound should play
• Long press home buttons
• should not hear more than 1 click

Patch 2

Patched MainUI binaries to run
mainui_off_order
instead of
customer/app/axp_test poweroff
by editing the string at 00151aa8

To test:

Test case 1

• Go to Settings
• Shutdown
• The device shuts down

Test case 2

• Plug in charging cable
• Wait until you see the charging animation
• Unplug the cable
• The device shuts down

This is called from two places:

• Settings -> Shutdown
  0x0001761c

undefined4 settingsShutdown(void)
{
  if (DAT_001808fc != '\0') {
    FUN_0014c5fc(&DAT_00181968,DAT_00181970,DAT_0017e764);
  }
  puts("poweroff2");
  system("sync");
  system("sleep 1");
  system("mainui_off_order"); //previously system("customer/app/axp_test poweroff")
  return 2;
}

• Charging manager
  0x000389d4

...
    if ((local_2c != 2) && (local_2c != 3)) {
      puts("usb unplug, poweroff");
      system("sync");
      system("mainui_off_order"); // previously system("customer/app/axp_test poweroff")
    }
...