.optimised-text() is used on room titles but not main chat area

.optimised-text() is used on room titles(.room-item__title) but not main chat area. The culprit is -webkit-font-smoothing: antialiased;.

With macOS 10.12.6

.	.	.
Gitter 1.177
Gitter 3.1.0

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As reported by @VladShcherbin September 26, 2017 11:50 AM

With macOS High Sierra 10.13 and I assume Gitter 3.1.0

moved to webapp-temp-issues-for-move#97