Tests: Fix compile after referred file has moved

Amends 5c658ac968.

Change-Id: Ia876cbd49edc60aeeaf564b787f3ec05c4b303aa
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

tests/auto/diff/differ/differ.pro

@@ -1,4 +1,4 @@
-QTC_PLUGIN_DEPENDS += diffeditor
+QTC_LIB_DEPENDS += utils
 
 include(../../qttest.pri)
 

tests/auto/diff/differ/differ.qbs

@@ -2,7 +2,7 @@ import qbs
 
 QtcAutotest {
     name: "Differ autotest"
-    Depends { name: "DiffEditor" }
+    Depends { name: "Utils" }
     Depends { name: "Qt.widgets" } // For QTextDocument
     files: "tst_differ.cpp"
 }

tests/auto/diff/differ/tst_differ.cpp

@@ -30,11 +30,11 @@
 #include <QTextBlock>
 #include <QMetaType>
 
-#include <diffeditor/differ.h>
+#include <utils/differ.h>
 
-Q_DECLARE_METATYPE(DiffEditor::Diff)
+Q_DECLARE_METATYPE(Utils::Diff)
 
-using namespace DiffEditor;
+using namespace Utils;
 
 QT_BEGIN_NAMESPACE
 namespace QTest {