fix bootstrap-vcpkg.sh command

[Botspot]

Fixed a typo

pi@raspberrypi:~/splatapult/vcpkg $ bootstrap-vcpg.sh
bootstrap-vcpg.sh: command not found
pi@raspberrypi:~/splatapult/vcpkg $ ./bootstrap-vcpg.sh
bash: ./bootstrap-vcpg.sh: No such file or directory
pi@raspberrypi:~/splatapult/vcpkg $ ls
bootstrap-vcpkg.bat  LICENSE.txt    README_ko_KR.md  SECURITY.md
bootstrap-vcpkg.sh   NOTICE_pt.txt  README.md        shell.nix
CONTRIBUTING.md      NOTICE.txt     README_pt.md     toolsrc
CONTRIBUTING_pt.md   ports          README_vn.md     triplets
CONTRIBUTING_zh.md   README_es.md   README_zh_CN.md  versions
docs                 README_fr.md   scripts
pi@raspberrypi:~/splatapult/vcpkg $ bootstrap-vcpkg.sh
bootstrap-vcpkg.sh: command not found
pi@raspberrypi:~/splatapult/vcpkg $ ./bootstrap-vcpkg.sh
Unable to determine a binary release of vcpkg; attempting to build from source.
Downloading vcpkg tool sources
Building vcpkg-tool...