cafe-desktop/ctk Static analyzer results

pixbufs: add G_GNUC_UNUSED in unused parameters

• 2024-09-19-175605-2451-cppcheck@bd2219b33c5f_unusedParameters
• 2024-09-19-173409-43638-1@bd2219b33c5f_unusedParameters
• 2024-09-19-175143-2703-cppcheck@00fd9082eced_unusedParameters logs 7190
• 2024-09-19-174839-0415-cppcheck@a324712b386e_unusedParameters logs 7192
• 2024-09-19-174504-6249-cppcheck@bc5f3a9b69ca_unusedParameters logs 7197
• 2024-09-19-174337-6996-cppcheck@ffd0c0653f2b_unusedParameters logs 7198
• 2024-09-19-174043-3398-cppcheck@81472dc7037e_unusedParameters logs 7205
• 2024-09-19-173834-2584-cppcheck@b56ede22c8f7_unusedParameters logs 7216
• 2024-09-19-172934-43638-1@00fd9082eced_unusedParameters logs 7190
• 2024-09-19-172716-7765-cppcheck@f24f5610b850_unusedParameters logs 7217
• 2024-09-19-172619-43637-1@a324712b386e_unusedParameters logs 7192
• 2024-09-19-172243-0275-cppcheck@d971fd4cddb7_unusedParameters logs 7224
• 2024-09-19-172241-43638-1@bc5f3a9b69ca_unusedParameters logs 7197
• 2024-09-19-172131-43638-1@ffd0c0653f2b_unusedParameters logs 7198
• 2024-09-19-171836-43636-1@81472dc7037e_unusedParameters logs 7205
• 2024-09-19-171502-43637-1@b56ede22c8f7_unusedParameters logs 7216
• 2024-09-19-170505-43637-1@f24f5610b850_unusedParameters logs 7217
• 2024-09-19-170037-43636-1@d971fd4cddb7_unusedParameters logs 7224
• 2024-09-16-154331-6259-cppcheck@c41f9bbef55c_unusedParameters logs 7227
• 2024-09-16-154114-1502-cppcheck@7e2b80f68978_unusedParameters logs 7235