Git: Fix git.cmd not found on windows

Change-Id: I89c7743331bb28bbabe946df3da8fede44652414
Reviewed-on: http://codereview.qt-project.org/6138
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/gitsettings.cpp

@@ -54,11 +54,10 @@ GitSettings::GitSettings()
 {
     setSettingsGroup(QLatin1String("Git"));
 
+    declareKey(binaryPathKey, QLatin1String("git"));
 #ifdef Q_OS_WIN
-    declareKey(binaryPathKey, QLatin1String("git.exe"));
     declareKey(timeoutKey, 60);
 #else
-    declareKey(binaryPathKey, QLatin1String("git"));
     declareKey(timeoutKey, 30);
 #endif
     declareKey(adoptPathKey, false);