Correct typo in the Gujarati openType identififer.

Based on testing by Paresh Adhia.

Task-number: QTBUG-44568
Change-Id: I11c9e304282ca5afbdb02a37c366a331a4f24b04
Reviewed-by: Konstantin Ritt <[email protected]>

Author: Michael Brüning

src/plugins/platforms/fontdatabases/fontconfig/qfontconfigdatabase.cpp

@@ -250,7 +250,7 @@ static const char *openType[] = {
     "deva",  // Devanagari
     "beng",  // Bengali
     "guru",  // Gurmukhi
-    "gurj",  // Gujarati
+    "gujr",  // Gujarati
     "orya",  // Oriya
     "taml",  // Tamil
     "telu",  // Telugu