additional typos and errors

various typos and inconsistencies

Line 272 duplicated in 277, causing error during compilation.
Text removed: "lv_obj_set_event_cb_mks(buttonXState, event_handler, ID_TMC_MODE_X, , 0);"

Compile failed with SINGLENOZZLE and EXTRUDERS = 2, because the UI was trying to draw preheat settings for 2 heaters when there is actually only 1 heater

2.Make a new board of robin nano35 as now the default version of robin nano is equipped with a 3.5-inch screen.