0502ddbe2b
The cursor constraint window is only set by the Editor. In the game launcher, this function was returning a null window, which makes `GetSystemCursorPositionNormalized()` unable to determine the cursor position. This in turn causes mouse input in ImGui to not work. Fixes #4722, LYN-7491 Signed-off-by: Chris Burel <burelc@amazon.com>