Remove commas after last item in enumeration.
Remove commas after last item in enumeration.

This brings these enums to match the rest of the code and fixes
2 warnings under clang about using C++11 extensions.

ocornut/imgui,dougbinks/imgui,nProtect/imgui,elect86/imgui,tom-seddon/imgui,Pagghiu/imgui,dougbinks/imgui,burningreggae/imgui,tom-seddon/imgui,cmaughan/imgui,wflohry/imgui-addons,cmaughan/imgui,elect86/imgui,ggtucker/imgui,cmaughan/imgui,ocornut/imgui,ocornut/imgui,bkaradzic/imgui,mikesart/imgui,wflohry/imgui-addons,burningreggae/imgui,cmaughan/imgui,bkaradzic/imgui,ggtucker/imgui,ggtucker/imgui,Flix01/imgui,mikesart/imgui,aimotive/imgui-glfw,aimotive/imgui-glfw,bkaradzic/imgui,nProtect/imgui,nProtect/imgui,Pagghiu/imgui,Flix01/imgui,Flix01/imgui