Remove superflous schoolapps stuff.

aleksis/apps/chronos/settings.py

-import dbsettings
-from django import forms
-
-from untisconnect.api_helper import get_terms, get_school_years
-
-choices_school_years = []
-school_years = get_school_years()
-for year in school_years:
-    choices_school_years.append((year.id, year.name))
-
-choices_terms = []
-terms = get_terms()
-for term in terms:
-    choices_terms.append((term.id, "{}, #{}: {}".format(term.school_year_id, term.id, term.name)))
-
-
-class UNTISSettings(dbsettings.Group):
-    school_year = dbsettings.PositiveIntegerValue("Schuljahr", widget=forms.Select, choices=choices_school_years)
-    term = dbsettings.IntegerValue("Periode", widget=forms.Select, choices=choices_terms,
-                                   help_text="Bitte wähle oberhalb auch das zur Periode passende Schuljahr aus.")
-
-
-untis_settings = UNTISSettings("UNTIS")