Security update for gthumb

This update for gthumb fixes the following issues:

Security issue fixed:

- CVE-2018-18718: Fixed a double-free in add_themes_from_dir function from dlg-contact-sheet.c (boo#1113749)

Fixed bugs
bnc#1113749
VUL-1: CVE-2018-18718: gthumb: double-free in the add_themes_from_dir method
Selected Binaries
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