SysRootKitInformation: Fix priority

Fix priority to have kit information listing not depend on order
of registration.

Change-Id: Iebb1cbb80eec07001a34e8799d768ec4bc2f2a26
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/kitinformation.cpp

@@ -68,7 +68,7 @@ Core::Id SysRootKitInformation::dataId() const
 
 unsigned int SysRootKitInformation::priority() const
 {
-    return 32000;
+    return 31000;
 }
 
 QVariant SysRootKitInformation::defaultValue(Kit *k) const