[USETUP] Use RtlStringCbPrintfA instead of sprintf

[USETUP] Use RtlStringCbPrintfA instead of sprintf

Fixes GCC 8 warning:
base/setup/usetup/usetup.c:3407:78: error: '%S' directive writing up to 521 bytes into a region of size 200 [-Werror=format-overflow=]
                 "Setup is currently unable to check a partition formatted in %S.\n"
                                                                              ^~
base/setup/usetup/usetup.c:3406:9: note: 'sprintf' output between 128 and 649 bytes into a destination of size 260
         sprintf(Buffer,
         ^~~~~~~~~~~~~~~
                 "Setup is currently unable to check a partition formatted in %S.\n"
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 "\n"
                 ~~~~
                 "  \x07  Press ENTER to continue Setup.\n"
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 "  \x07  Press F3 to quit Setup.",
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 PartEntry->FileSystem);
                 ~~~~~~~~~~~~~~~~~~~~~~