BGE: Fix to make KX_CharacterWrapper.jumpCount work a bit smoother. Previously jumpCount was only getting reset to 0 if the character was on the ground while jump() was being called. This works alright internally for double jumping, but it made things awkward if a user wanted to check jumpCount before calling jump() (i.e., before jumpCount was updated).

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54400 954f8c5b-7b00-dc11-b283-0030488c597c