Fixed a silly typo in the iPhone code.

juce_amalgamated.cpp

@@ -241320,7 +241320,7 @@ const Point<int> UIViewComponentPeer::relativePositionToGlobal (const Point<int>
 
 const Point<int> UIViewComponentPeer::globalPositionToRelative (const Point<int>& screenPosition)
 {
-	return screenPosition + getScreenPosition();
+	return screenPosition - getScreenPosition();
 }
 
 CGRect UIViewComponentPeer::constrainRect (CGRect r)

src/native/mac/juce_iphone_UIViewComponentPeer.mm

@@ -490,7 +490,7 @@ const Point<int> UIViewComponentPeer::relativePositionToGlobal (const Point<int>
 
 const Point<int> UIViewComponentPeer::globalPositionToRelative (const Point<int>& screenPosition)
 {
-    return screenPosition + getScreenPosition();
+    return screenPosition - getScreenPosition();
 }
 
 CGRect UIViewComponentPeer::constrainRect (CGRect r)