Rename misleading variables
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runtime: Rename some misleading variables
Paths derived from self->overrides are valid in the current execution environment, but if we're running in a Flatpak environment, that's not the host. Rename them accordingly.
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runtime: Rename another misleading variable
srt_vulkan_layer_get_json_path() and srt_vulkan_icd_get_json_path() return paths relative to the SrtSystemInfo's sysroot (the graphics driver provider), which might be the root filesystem, but might equally be /run/host when we're running inside Flatpak. Rename this variable accordingly.
We were already using it correctly: the third argument to pv_runtime_take_from_provider() is a path in the provider sysroot.
/cc @denittis