Fix portable build crash log#1338
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…LL (which it is always on portable builds)
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Sys_DefaultHomePath() returns NULL on portable builds, causing logfiles to have an invalid path previously. Sys_ErrorDialog passed that straight into Com_sprintf("%s") and Sys_Mkdir without a check, which is undefined behaviour.
Fall back to the install path (Sys_DefaultInstallPath) when homepath is unavailable, mirroring the homepath/basepath fallback the FS already uses for fs_homepath.