Use font ascender height for baseline offset (#139)

## Summary

* Use font ascender height for baseline offset
* Previously was using font height, but when rendering the font (even
from y = 0), there would be a lot of top margin
* Font would also go below the "bottom of the line" as we were using the
full font height as the baseline

## Additional Context

* This caused some text to move around, I've fixed everything I can
* Notably it moves the first line of font a little closer to the top of
the page

src/activities/reader/EpubReaderActivity.cpp

@@ -410,7 +410,7 @@ void EpubReaderActivity::renderStatusBar(const int orientedMarginRight, const in
 
   // Position status bar near the bottom of the logical screen, regardless of orientation
   const auto screenHeight = renderer.getScreenHeight();
-  const auto textY = screenHeight - orientedMarginBottom - 2;
+  const auto textY = screenHeight - orientedMarginBottom + 2;
   int percentageTextWidth = 0;
   int progressTextWidth = 0;