I am hoping I am understanding the question correctly. This will completely remove the link from the title/caption/description/whatever so that it is all just plain text. The image will still have the link attached. Please note that changing this will remove the link from the title/caption/description on all slideshows.
Navigate to \wp-content\plugins\slideshow-jquery-image-gallery\views\SlideshowPluginSlideshowSlide\
For me it is on line 105 and 106 but search for the lines containing this code: