tweak font size

Author: Kathryn Dale

metrics/interfaces/charts/common/chart_output.py

@@ -45,7 +45,7 @@ def _apply_watermark(self) -> None:
 
         width = self.figure.layout.width or 800
 
-        max_font_size = int((width * 0.9) / (len(watermark_text) * 0.5))
+        max_font_size = int((width * 0.85) / (len(watermark_text) * 0.65))
 
         WATERMARK_FONT_SIZE = max(12, min(max_font_size, 100))