[BUG] Using RTL direction breaks visuals for WeekView

[MuKhAlm]

Related to #400 in the sense that many locales support RTL directionality.

Widget snippet

SizedBox(
   height: 1000,
   child: WeekView(
      controller: eventController,
      startHour: 6,
      endHour: 19,
    ),
),