Correct the ESC behavior in ConfigApp (#429)

## Description

The ESC behavior is not correct in ConfigApp, the string claims a reboot will occur, but the actual behavior is to return to the main menu.

- [ ] Impacts functionality?
- [ ] Impacts security?
- [ ] Breaking change?
- [ ] Includes tests?
- [ ] Includes documentation?

## How This Was Tested

Boot to ConfigApp and observe ESC help string.

## Integration Instructions

N/A

SetupDataPkg/ConfApp/BootOptions.c

@@ -35,7 +35,7 @@ CONST ConfAppKeyOptions  StaticBootOptions[STATIC_BOOT_OPTIONS] = {
   {
     .KeyName             = L"ESC",
     .KeyNameTextAttr     = EFI_TEXT_ATTR (EFI_YELLOW, EFI_BLACK),
-    .Description         = L"Exit this menu and reboot system.",
+    .Description         = L"Return to main menu.",
     .DescriptionTextAttr = EFI_TEXT_ATTR (EFI_WHITE, EFI_BLACK),
     .UnicodeChar         = CHAR_NULL,
     .ScanCode            = SCAN_ESC,