QDecompressHelper: Change order of encodings

Before the introduction of QDecompressHelper gzip was preferred over
deflate. The change seems to be accidental. Amends commit
7b76379a89.

Change-Id: I70f33d551912465d63f49ea3db1ac3575d19a92d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/network/access/qdecompresshelper.cpp

@@ -59,8 +59,8 @@ struct ContentEncodingMapping
 };
 
 constexpr ContentEncodingMapping contentEncodingMapping[] {
-    { "deflate", QDecompressHelper::Deflate },
     { "gzip", QDecompressHelper::GZip },
+    { "deflate", QDecompressHelper::Deflate },
 #if QT_CONFIG(brotli)
     { "br", QDecompressHelper::Brotli },
 #endif

tests/auto/network/access/qdecompresshelper/tst_qdecompresshelper.cpp

@@ -90,6 +90,8 @@ void tst_QDecompressHelper::encodingSupported()
     QVERIFY(accepted.contains("gzip"));
     int expected = 2;
 
+    QVERIFY(accepted.indexOf("gzip") < accepted.indexOf("deflate"));
+
 #if QT_CONFIG(brotli)
     QVERIFY(QDecompressHelper::isSupportedEncoding("br"));
     QVERIFY(accepted.contains("br"));