Use Utils::Storage instead of QVariantMap in a few places

Change-Id: I02833cf2bc3caaadc22ff93ae530e4aebe4c3868
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/python/pythonproject.h

@@ -21,7 +21,7 @@ public:
     bool needsConfiguration() const final { return false; }
 
 private:
-    RestoreResult fromMap(const QVariantMap &map, QString *errorMessage) override;
+    RestoreResult fromMap(const Utils::Storage &map, QString *errorMessage) override;
 };
 
 } // Python::Internal