GPUImagePicture: don't redraw using CoreGraphics unless you have to

There was support for this but it appeared to have been disabled.

framework/Source/iOS/GPUImagePicture.m

@@ -74,7 +74,7 @@ - (id)initWithCGImage:(CGImageRef)newImageSource smoothlyScaleOutput:(BOOL)smoot
     pixelSizeOfImage = CGSizeMake(widthOfImage, heightOfImage);
     CGSize pixelSizeToUseForTexture = pixelSizeOfImage;
 
-    BOOL shouldRedrawUsingCoreGraphics = YES;
+    BOOL shouldRedrawUsingCoreGraphics = NO;
 
     // For now, deal with images larger than the maximum texture size by resizing to be within that limit
     CGSize scaledImageSizeToFitOnGPU = [GPUImageContext sizeThatFitsWithinATextureForSize:pixelSizeOfImage];