mod: change default offset in fit_page_width/height mode

set to the top of page

unireader.lua

@@ -233,24 +233,22 @@ function UniReader:setzoom(page)
 	if self.globalzoommode == self.ZOOM_FIT_TO_CONTENT then
 		if (x1 - x0) < pwidth then
 			self.globalzoom = width / (x1 - x0)
-			self.offset_x = -1 * x0 * self.globalzoom
-			self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
 			if height / (y1 - y0) < self.globalzoom then
 				self.globalzoom = height / (y1 - y0)
-				self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
-				self.offset_y = -1 * y0 * self.globalzoom
 			end
+			self.offset_x = -1 * x0 * self.globalzoom
+			self.offset_y = -1 * y0 * self.globalzoom
 		end
 	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_WIDTH then
 		if (x1 - x0) < pwidth then
 			self.globalzoom = width / (x1 - x0)
 			self.offset_x = -1 * x0 * self.globalzoom
-			self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
+			self.offset_y = -1 * y0 * self.globalzoom
 		end
 	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_HEIGHT then
 		if (y1 - y0) < pheight then
 			self.globalzoom = height / (y1 - y0)
-			self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
+			self.offset_x = -1 * x0 * self.globalzoom
 			self.offset_y = -1 * y0 * self.globalzoom
 		end
 	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_HALF_WIDTH