Fixed file flushing for FileOutputStream on Windows

modules/juce_core/files/juce_FileOutputStream.cpp

@@ -43,7 +43,7 @@ FileOutputStream::FileOutputStream (const File& f, const size_t bufferSizeToUse)
 
 FileOutputStream::~FileOutputStream()
 {
-    flushBuffer();
+    flush();
     closeHandle();
 }