Fix gui segfault caused by bitcoin/bitcoin#22216

Reported by Hennadii Stepanov https://github.com/bitcoin/bitcoin/pull/22216#issuecomment-859790682

Fixes bitcoin/bitcoin#22227

src/qt/bitcoin.cpp

@@ -490,6 +490,7 @@ int GuiMain(int argc, char* argv[])
 
     /// 2. Parse command-line options. We do this after qt in order to show an error if there are problems parsing these
     // Command-line options take precedence:
+    node_context.args = &gArgs;
     SetupServerArgs(gArgs);
     SetupUIArgs(gArgs);
     std::string error;