CppEditor: Prevent showing unwanted function template parameters

Task-number: QTCREATORBUG-28186
Change-Id: Ic52090e873b4defa68cf98e2a5d08f2f0604e714
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfixes.cpp

@@ -6277,6 +6277,7 @@ QString definitionSignature(const CppQuickFixInterface *assist,
         oo.includeWhiteSpaceInOperatorName = operatorNameText.contains(QLatin1Char(' '));
     }
     const QString nameText = oo.prettyName(LookupContext::minimalName(func, cppCoN, control));
+    oo.showTemplateParameters = false;
     const FullySpecifiedType tn = rewriteType(func->type(), &env, control);
 
     return oo.prettyType(tn, nameText);