formatting and removed getReaderScreenMargin as it was never used

I wasn't 100% sure this wasn't left over from me but gitblame says it came from someone else. Either way I don't see anywhere it's used so I THINK it's dead code

src/CrossPointSettings.h

@@ -97,7 +97,6 @@ class CrossPointSettings {
   float getReaderLineCompression() const;
   unsigned long getSleepTimeoutMs() const;
   int getRefreshFrequency() const;
-  int getReaderScreenMargin() const;
 };
 
 // Helper macro to access settings

src/activities/browser/OpdsBookBrowserActivity.cpp

@@ -396,4 +396,3 @@ void OpdsBookBrowserActivity::checkAndConnectWifi() {
     updateRequired = true;
   }
 }
-