Fix semicolon parsing in visual shader expression

scene/resources/visual_shader.cpp

@@ -2463,6 +2463,7 @@ String VisualShaderNodeExpression::generate_code(Shader::Mode p_mode, VisualShad
 	if (pre_symbols.empty()) {
 		pre_symbols.push_back("\t");
 		pre_symbols.push_back(",");
+		pre_symbols.push_back(";");
 		pre_symbols.push_back("{");
 		pre_symbols.push_back("[");
 		pre_symbols.push_back("(");