Fix indentation of 'Init CVC' message in standard output

[jhenin]

A tiny change, move a cvm::increase_depth(); instruction up so that the message "initializing component" lines up with the parameters below, consistently with all other objects.

Before the change:

colvars:   Initializing a new collective variable.
colvars:   # name = "d"
colvars:   Initializing a new "distance" component.
colvars:     # name = "" [default]

After:

colvars:   Initializing a new collective variable.
colvars:   # name = "d"
colvars:     Initializing a new "distance" component.
colvars:     # name = "" [default]