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[example][python][bugfix] Fix quadrature order in

Carsten Gräser requested to merge bugfix/fix-poisson-examle into master

When using Q4 ansatz functions, the product of gradients is still a 4th order polynomial. Hence we should use order 4 for integration. While the solution looks ok with order 3, it is actually slightly different and one would probably not get the correct 2nd order convergence.

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