Fix inhinit gnome session
Only try to inhibit the gnome session, when running inside a GNOME session. Check the environment variable for verification.
2020-02-12T20:51:03.730 minarca[]: WARN -Thread-0-c.p.m.core.internal.PowerManagement: inhibit gnome session return an error
java.lang.RuntimeException: Cannot Resolve Session Bus Address
at org.freedesktop.dbus.connections.impl.DBusConnection.lambda$getConnection$1(DBusConnection.java:239)
at org.freedesktop.dbus.connections.impl.DBusConnection.getConnection(DBusConnection.java:160)
at org.freedesktop.dbus.connections.impl.DBusConnection.getConnection(DBusConnection.java:223)
at org.freedesktop.dbus.connections.impl.DBusConnection.getConnection(DBusConnection.java:179)
at com.patrikdufresne.minarca.core.internal.PowerManagement.uninhibitLinux(PowerManagement.java:152)
at com.patrikdufresne.minarca.core.internal.PowerManagement.uninhibit(PowerManagement.java:146)
at com.patrikdufresne.minarca.core.API$1.run(API.java:199)