Missing Linux compatibility due to incorrect case.

When creating new shaders on the Linux version of Unity, Shader forge crashes because it tries to open presetPBR.shader, when the file is actually named PresetPBR.shader. Note that on Linux files are case sensitive. The rest (i.e. when loading the named shader manually) seems to work fine on Linux. Just fixing these incorrect file names would create Linux compatibility which would be appreciated. Thanks!