add fullscreen into pa_prefs class, and default to False if not set

options.py

@@ -19,6 +19,7 @@ class PA_PREF(db.Model):
     st_offset = db.Column(db.Integer, unique=False, nullable=False )
     size = db.Column(db.Integer, unique=False, nullable=False )
     folders = db.Column(db.Boolean, unique=False, nullable=False )
+    fullscreen = db.Column(db.Boolean, unique=False, nullable=False )
     
     def __repr__(self):
         return f"<pa_user_dn: {self.pa_user_dn}, path_type: {self.path_type}, noo: {self.noo}, grouping: {self.grouping}, how_many: {self.how_many}, st_offset: {self.st_offset}, size: {self.size}, folders: {self.folders}>"
@@ -102,6 +103,8 @@ class Options(PA):
             self.cwd = request.form['cwd']
             if 'fullscreen' in request.form:
                 self.fullscreen=request.form['fullscreen']
+            else:   
+                self.fullscreen=False
             if 'prev' in request.form:
                 self.offset -= int(self.how_many)
                 if self.offset < 0: