tst_QMessageLogger: rename helper main.cpp -> qlogging_helper.cpp

So it's easier to find in the IDE, as otherwise everything is
"main.cpp".

Change-Id: I8d4663c84603113376a1fffd2f78f87635f3310f
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
(cherry picked from commit 037f6be4280ed73a3fd53ca55fb38ad10b0db3ab)
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/corelib/global/qlogging/CMakeLists.txt

@@ -10,7 +10,7 @@ endif()
 qt_internal_add_executable(qlogging_helper
     NO_INSTALL
     OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-    SOURCES app/main.cpp
+    SOURCES qlogging_helper.cpp
     DEFINES QT_MESSAGELOGCONTEXT
     LIBRARIES Qt::Core)
 

tests/auto/corelib/global/qlogging/qlogging_helper.cpp

@@ -60,4 +60,4 @@ int main(int argc, char **argv)
     return 0;
 }
 
-#include "main.moc"
+#include "qlogging_helper.moc"