Mistake in 4d668e6825. `draw_seq_strips()` would use
`UI_view2d_view_orthoSpecial()` to only scale drawing horizontally, but
didn't reset the matrix state for normal view-space drawing.
Note that such matrix state management should probably happen in
`draw_timeline_seq()` directly so it's clear what the current state is.
Otherwise state management is hidden in nested function calls and hard
to track.
Julian Eisel