Adjust the Vita's resolution to be 240 pixels tall

The new resolution is still 16:10, but the viewport won't reveal things
that aren't supposed to be shown if the hieght is 240 pixels tall.

Author: xordspar0

src/graphics/Renderer.cpp

@@ -181,8 +181,8 @@ bool Renderer::setResolution(int scale, bool newWidescreen)
 {
   int newWidth, newHeight;
 #if defined(__VITA__)
-  newWidth = 480;
-  newHeight = 272;
+  newWidth = 384;
+  newHeight = 240;
   newWidescreen = true;
 #else
 #if defined(__SWITCH__)