fix base wizard size

if we are forced to fetch the theme early before the MiscSettings in svtools
sets it then don't cache the value so that when the MiscSettings kicks in that
the SettingsChanged signal is sent out and we get the right fontsize (or
something like that)

Change-Id: I0447c934ec184232591183c6c099a4d7217183fb
(cherry picked from commit e9bb7c9e)

vcl/source/app/settings.cxx

@@ -3026,23 +3026,23 @@ StyleSettings::SetIconTheme(const OUString& theme)
 OUString
 StyleSettings::DetermineIconTheme() const
 {
-    if (mxData->mIconTheme.isEmpty())
+    OUString sTheme(mxData->mIconTheme);
+    if (sTheme.isEmpty())
     {
         // read from the configuration, or fallback to what the desktop wants
         uno::Reference<uno::XComponentContext> xContext(comphelper::getProcessComponentContext());
         if (xContext.is())
         {
-            mxData->mIconTheme = officecfg::Office::Common::Misc::SymbolStyle::get(xContext);
+            sTheme = officecfg::Office::Common::Misc::SymbolStyle::get(xContext);
 
-            if (mxData->mIconTheme.isEmpty() || mxData->mIconTheme == "auto")
-                mxData->mIconTheme = GetAutomaticallyChosenIconTheme();
+            if (sTheme.isEmpty() || sTheme == "auto")
+                sTheme = GetAutomaticallyChosenIconTheme();
         }
     }
 
     OUString r = mxData->mIconThemeSelector->SelectIconTheme(
                         mxData->mIconThemeScanner->GetFoundIconThemes(),
-                        mxData->mIconTheme
-                        );
+                        sTheme);
     return r;
 }