GSFilterPlugin: template misses `[super setup]` call

Lines 55 to 56 in 27cc016

    
           - (NSError *)setup { 
        
           	NSNumber *firstValueNumber = (NSNumber *)[_fontMaster userDataForKey:@"theFirstValue"];

Needs to insert

[super setup];

here, otherwise we end up having nil in _shadowLayers at - process: and the filter won't work as the container will never be initialized.

	- (NSError *)setup {
	NSNumber firstValueNumber = (NSNumber )[_fontMaster userDataForKey:@"theFirstValue"];