Wrap variable initializations after '=' consistently

Replace a few occurrences of

        type var
            = value;

with

        type var =
            value;

which is used much more widely in wx sources for consistency.

Also get rid of a couple of such lines, when it could be done easily.

No real changes.

src/msw/app.cpp

@@ -794,8 +794,8 @@ void wxApp::MSWProcessPendingEventsIfNeeded()
 {
     // The cast below is safe as wxEventLoop derives from wxMSWEventLoopBase in
     // both console and GUI applications.
-    wxMSWEventLoopBase * const evtLoop
-        = static_cast<wxMSWEventLoopBase *>(wxEventLoop::GetActive());
+    wxMSWEventLoopBase * const evtLoop =
+        static_cast<wxMSWEventLoopBase *>(wxEventLoop::GetActive());
     if ( evtLoop && evtLoop->MSWIsWakeUpRequested() )
         ProcessPendingEvents();
 }