* add 'g++' to actualbudget-install.sh
The install script fails on line 53 (`$STD npm install --location=global @actual-app/sync-server`).
Installing `gcc`, which is required by `better-sqlite3`, which `@actual-app/sync-server` depends on, is the solution.
Added `g++` to the dependency line `18`.
* formatting
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Co-authored-by: CanbiZ <47820557+MickLesk@users.noreply.github.com>
