Reset qml code model after build

Reset the code model after a build, so it can re-scan the build folder
for changed .qmltypes files.

This fixes the issue of the QtC embedded code model not recognizing
modules and .qmltypes files after a build on qmake projects.

Fixes: QTCREATORBUG-24428
Change-Id: I1e584addd2fe9b0918a8fd9b372b4fa23b72f36b
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Semih Yavuz <semih.yavuz@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qmakeprojectmanager/qmakeproject.cpp

@@ -745,8 +745,10 @@ void QmakeBuildSystem::asyncUpdate()
 
 void QmakeBuildSystem::buildFinished(bool success)
 {
-    if (success)
+    if (success) {
         m_invalidateQmakeVfsContents = true;
+        updateQmlJSCodeModel();
+    }
 }
 
 Tasks QmakeProject::projectIssues(const Kit *k) const