Fix wrong XDG patch for tdelibs, which resulted in missing icons.

This partially reverts commit 4e765ab579.

Signed-off-by: Chris <xchrisx@uber.space>
(cherry picked from commit bc5150d64e)

tdecert/tdecertpart.desktop

@@ -83,7 +83,7 @@ Comment[zh_HK]=可嵌入的個人證書管理工具
 Comment[zh_TW]=可嵌入的個人認證管理工具
 Comment[zu]=Imeneja Yesitifiketi Sobunini Oshuthekiwe
 MimeType=application/x-pkcs12;application/x-x509-ca-cert;application/binary-certificate;
-Icon=computer-lock-screen
+Icon=system-lock-screen
 Name=KCertPart
 Name[af]=Kcertpart
 Name[bn]=কে-সার্ট-পার্ট