qmlls: fix manual test

Fix the module name, it seems that the author didn't realize the
mismatched case probably due to his case-insensitive file system. Also
add an artificial warning (assigning to inexisting property `invalid`)
to better distinguish the cases of "qmlls has no lint warnings to show
about the module import" and "qmlls crashed and thats why no lint
warnings are to be seen".

Task-number: QTBUG-119163
Change-Id: I32735dfa08417ca1dba11f4a4899a040907c4999
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

tests/manual/qmlls-cmake-builds/Main.qml

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 import QtQuick
-import autoGenCMake
+import AutoGenCMake
 
 Window {
     width: 640
@@ -10,5 +10,9 @@ Window {
     visible: true
     title: qsTr("Hello World")
 
-    HelloWorld { myP: 55; myPPP: 55 }
+    HelloWorld {
+        myP: 55
+        myPPP: 55
+        invalid: 123
+    }
 }