Update first 2D game input mapping event configuration image (#9128)

* Update first 2D game input mapping event configuration image

The previous photo contained a typo which is no longer present in
Godot 4.2 ("Poistion" -> "Position").

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Signed-off-by: Ido Savion <[email protected]>
(cherry picked from commit 4f04a2726e9042f770bbc325824561a1cbfc7ff4)