[gnome-photos] libgd: Revert unintended change

[Debarshi Ray <debarshir src gnome org>]

commit dce6e4e19f0a1897dbdf29bde6beb49e062fb577
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Dec 12 20:05:40 2018 +0100

    libgd: Revert unintended change
    
    Fallout from 6b0a5af4367aa9ba2c31d62819e1ca28dc6f3770

 subprojects/libgd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/subprojects/libgd b/subprojects/libgd
index 7ae254bf..f01717a2 160000
--- a/subprojects/libgd
+++ b/subprojects/libgd
@@ -1 +1 @@
-Subproject commit 7ae254bfc5f641c60566614e08245176f7bc5aa8
+Subproject commit f01717a24fb7f5b24b1f4865818437f060e83932