Fix: Correct logic for choosing the CICD service

[nkhanh44]

Issue

Same issue with choosing setup interface issue, when accidentally typing a different character, the process continues with any case contains that character instead of requesting to retry.

Expected

• Only accept g, b, c, l, github, bitrise, codemagic, later with all upper and lower cases. Otherwise, requiring to type again.
• Same with choosing workflow runner: m, macOS, s, self-hosted, l, later.

Steps to reproduce

1. Run script generating project.
2. At Which CI/CD service do you use (Can be edited later) [(g)ithub/(b)itrise/(c)odemagic/(l)ater]: type a random character r