* demo: fix errors and warnings in GLFW Vulkan demo
* demo: improve resize handling in GLFW Vulkan demo
On my machine (x86_64 Linux, Wayland) VK_SUBOPTIMAL or
VK_OUT_OF_DATE_KHR were never returned so the resizing of the swapchain
never happened.
Fix by using GLFW's resize callback to detect a window resize and a
swapchain recreation. Vulkan tutorial uses the same approach.
fb_scale was never used in the Vulkan backend, so it was removed.
* demo: fix copy&paste typo in GLFW Vulkan demo
* demo: sync nuklear_glfw_vulkan.in.h with nuklear_glfw_vulkan.h
Over time people have not been noticing that the expected workflow is to
build nuklear_glfw_vulkan.h from nuklear_glfw_vulkan.in.h
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