maint: Fix typos, shebang and simplify a conditional.
* scripts/deploy-packages.sh: Use /usr/bin/env as the shebang as it is more susceptible to work on all systems (e.g. Guix System). Fix typo in header comment. (package_deb) [qt]: Use a Bash regexp test and an if instead of a case. Change-Id: Ifa986ddb3bcbea8bacc6af8e510dc64b938588f4