Read setsolver options from optical train settings

With the introduction of optical trains some align settings were transferred to be saved in optical train settings. Unfortunately the option "gotoMode" of solver actions is still read in globally from "kstarsrc" but a routine to write back the currently active "gotoMode" to "kstarsrc" is not present anymore. It is already saved in optical train settings however! This MR provides the code to read the saved solver action from optical train settings, setting a default "gotoMode" with every optical train.