fix: Adjust clocks on correct turns

On white's move, we should keep black's previous turn clock, as they have not played yet.
This was not happening before, which was causing black's clock to go back and forward.
Now the main frame encoding loop checks if it needs to fetch black's previous turn clock.

src/drawer.rs

@@ -248,6 +248,10 @@ impl BoardDrawer {
         self.size
     }
 
+    pub fn flip(&self) -> bool {
+        self.flip
+    }
+
     pub fn image_buffer(&self) -> RgbaImage {
         ImageBuffer::new(self.size, self.size)
     }

src/giffer.rs

@@ -603,18 +603,13 @@ impl Visitor for PGNGiffer {
             log::debug!("Building frame for board number: {}", n);
             log::debug!("Board width: {}, height: {}", b.width(), b.height());
 
-            let turn = n / 2;
+            let turn = if n == 0 { n } else { (n - 1) / 2 };
 
-            let mut white_clock = self.clocks.white.get(turn);
+            let white_clock = self.clocks.white.get(turn);
             let mut black_clock = self.clocks.black.get(turn);
 
-            if n == (total_frames - 1) {
-                if white_clock.is_none() {
-                    white_clock = self.clocks.white.get(turn - 1);
-                }
-                if black_clock.is_none() {
-                    black_clock = self.clocks.black.get(turn - 1);
-                }
+            if turn > 0 && n % 2 != 0 {
+                black_clock = self.clocks.black.get(turn - 1);
             }
 
             if white_clock.is_some()