Adjust chmod to 644 for dev content

The following file have execute permission. They shall have chmod 644 (rw-r-r-) only. Execute permission must be granted in the build process or by the user, if necessary at all.

• core-feature-pack/common/src/main/resources/content/bin/add-user.sh
• core-feature-pack/common/src/main/resources/content/bin/domain.sh
• core-feature-pack/common/src/main/resources/content/bin/elytron-tool.bat
• core-feature-pack/common/src/main/resources/content/bin/jboss-cli.sh
• core-feature-pack/common/src/main/resources/content/bin/standalone.sh
• core-feature-pack/common/src/main/resources/content/docs/contrib/scripts/init.d/wildfly-init-debian.sh
• core-feature-pack/common/src/main/resources/content/docs/contrib/scripts/init.d/wildfly-init-redhat.sh
• core-feature-pack/common/src/main/resources/content/docs/contrib/scripts/init.d/wildfly.conf
• domain-http/error-context/src/main/resources/index.html
• domain-http/error-context/src/main/resources/normalize.css
• domain-http/error-context/src/main/resources/normalize.min.css