is_directional_mode: Check for directional modes directly.
Earlier, the condition was negating all non-directional modes to check if a mode is directional. This was error-prone, e.g. when a new non-directional mode is added. By checking for directional modes directly, we avoid such errors. Change-Id: Ia4a62e278cd73078c53ed5096db646eff77f054e
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