UI Fix: start with full hourglass on short timer durations

We were positioning relative to "blink" time (2s), rather than delete
time, which means that for 10s timers we were starting as though only 8s
remained.

// FREEBIE

Signal/src/ViewControllers/ConversationView/Cells/OWSExpirationTimerView.m

@@ -159,8 +159,8 @@ const CGFloat kExpirationTimerViewSize = 16.f;
         OWSFail(@"initialDurationSeconds was unexpectedly 0");
         return;
     }
-    
-    CGFloat ratioRemaining = (CGFloat)timeUntilFlashing / (CGFloat)self.initialDurationSeconds;
+
+    CGFloat ratioRemaining = (CGFloat)secondsLeft / (CGFloat)self.initialDurationSeconds;
     CGFloat ratioComplete = CGFloatClamp((CGFloat)1.0 - ratioRemaining, 0, 1.0);
     CGPoint startPosition = CGPointMake(0, self.fullHourglassImageView.height * ratioComplete);