2.1 Update content

[list] [*] Fix the bug that there is no flashlight in Qin Hong's hand after turning on the flashlight when he walks [*] Fix the bug that the screen becomes dark after entering the principal's office [*] Fix the problem that the ghost flickers back to the corridor after the small wooden horse trigger appears in the school building [*] Fix the problem that the coordinates of Qin Hong's character when running are biased upwards [/list]