Set correct Section type for QDateTimeParser::last

Setting it to FirstSection was obviously wrong and left LastSection
nowhere set ...

Change-Id: I26260182e9d986b41b5f3a5d6df94540a5fc116a
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@theqtcompany.com>

src/corelib/tools/qdatetimeparser_p.h

@@ -87,7 +87,7 @@ public:
         first.pos = -1;
         first.count = -1;
         first.zeroesAdded = 0;
-        last.type = FirstSection;
+        last.type = LastSection;
         last.pos = -1;
         last.count = -1;
         last.zeroesAdded = 0;