Upgrade Open-MCT dependency to release 1.7.8

[nunoguedelha]

• Refer to https://github.com/ami-iit/yarp-openmct/issues/70, https://github.com/ami-iit/yarp-openmct/issues/81 and Open-MCT release https://github.com/nasa/openmct/releases/tag/1.7.8.
• Installed the dependency running:
  1. cd openmctStaticServer
  2. npm install --save-exact
  3. npm clean-install
• "npm clean-install" installs the project from a clean slate. The differences between this command and "install" are mainly: (from command "npm help clean-install")
  • The project must have an existing package-lock.json or npm-shrinkwrap.json.
  • If dependencies in the package lock do not match those in package.json, npm ci will exit with an error, instead of updating the package lock.
  • npm ci can only install entire projects at a time: individual dependencies cannot be added with this command.
  • If a node_modules is already present, it will be automatically removed before npm ci begins its install.
  • It will never write to package.json or any of the package-locks: installs are essentially frozen.
• The package-lock.json was committed after step 2.