Address review comments and Codacy comments in the previous commit.

...leuthkit/autopsy/imagegallery/ImageGalleryController.java

...rg/sleuthkit/autopsy/imagegallery/ImageGalleryModule.java

...uthkit/autopsy/imagegallery/ImageGalleryTopComponent.java

...rg/sleuthkit/autopsy/imagegallery/actions/OpenAction.java

.../sleuthkit/autopsy/imagegallery/datamodel/DrawableDB.java

...rg/sleuthkit/autopsy/imagegallery/gui/DataSourceCell.java

release/update_autopsy_version.pl

release/update_sleuthkit_version.pl