addons/imguipanelmanager/imguipanelmanager.cpp: renamed a method to match the change in ImGui upstream repository.
addons/imguipanelmanager/imguipanelmanager.cpp: renamed a method to match the change in ImGui upstream repository.

Flix01/imgui,Flix01/imgui,wflohry/imgui-addons,tom-seddon/imgui,wflohry/imgui-addons,Flix01/imgui,tom-seddon/imgui