www/dooble: Fix compiling on 16-CURRENT

In file included from Source/dooble_charts_file.cc:30:
In file included from /usr/local/include/qt6/QtQml/QJSEngine:1:
In file included from /usr/local/include/qt6/QtQml/qjsengine.h:13:
/usr/local/include/qt6/QtCore/qtimezone.h:86:9: error: '= delete' with a message is a C++2c extension [-Werror,-Wc++26-extensions]

86 |         "Would be treated as int offsetSeconds. "
   |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
87 |         "Use QTimeZone::UTC or QTimeZone::LocalTime instead.");
   |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/usr/local/include/qt6/QtCore/qcompilerdetection.h:1046:49: note: expanded from macro 'Q_DECL_EQ_DELETE_X'
1046 | # define Q_DECL_EQ_DELETE_X(reason) = delete(reason)

|                                                 ^~~~~~

PR: 299033
Reported by: pkg-fallout
Sponsored by: UNIS Labs (vvd, commit patch)
MFH: 2026Q4