debugger: use the new enum

src/plugins/debugger/gdb/pythongdbengine.cpp

@@ -154,9 +154,8 @@ void GdbEngine::handleStackFramePython(const GdbResponse &response)
             dummy.iname = child.findChild("iname").data();
             GdbMi wname = child.findChild("wname");
             if (wname.isValid()) {
-                // Happens (only) for watched expressions. They are encoded as.
-                // base64 encoded 8 bit data, without quotes
-                dummy.name = decodeData(wname.data(), 5);
+                // Happens (only) for watched expressions.
+                dummy.name = decodeData(wname.data(), Base64Encoded8Bit);
                 dummy.exp = dummy.name.toUtf8();
             } else {
                 dummy.name = _(child.findChild("name").data());