fix: prompt checks for git credentials storage was case-sensitive

[benPearce1]

fixes #222

before:

❯ octopus project create --process-vcs -n ${PWD##*/} -l "Default Lifecycle"  -g "Default Project Group" --git-url $(git config --get remote.origin.url) --git-credentials git-creds --git-credential-store "Library" -s Default
? Git username [? for help]
interrupt

after:

❯ octopus project create --process-vcs -n ${PWD##*/} -l "Default Lifecycle"  -g "Default Project Group" --git-url $(git config --get remote.origin.url) --git-credentials git-creds --git-credential-store "Library" -s Default
? Git repository base path .octopus/octopus
? Git branch main
? Enter a protected branch pattern (enter blank to end)
? Initial Git commit message Initial commit of deployment process

Successfully created project 'octopus' (octopus), with lifecycle 'Default Lifecycle' in project group 'Default Project Group'.
View this project on Octopus Deploy: http://localhost:8065/app#/Spaces-1/projects/Projects-3802
Successfully configured Config as Code on 'octopus'

[hnrkndrssn]

👍