am_net: Add missing function to the function table

src/core/hle/service/am/am_net.cpp

@@ -28,6 +28,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x08130000, nullptr,               "GetTotalContents"},
     {0x08140042, nullptr,               "GetContentIndexes"},
     {0x08150044, nullptr,               "GetContentsInfo"},
+    {0x08180042, nullptr,               "GetCTCert"},
     {0x08190108, nullptr,               "SetCertificates"},
     {0x081B00C2, nullptr,               "InstallTitlesFinish"},
 };