Pop up window can be rolled when error message is long

[silySuper]

In offline sign page（same to other pop up window） ,when error message is long, the error window can be rolled actually.
In expect the error window should not be rolled ,and requires automatic line wrapping.

[devchenyan]

fixed: nervosnetwork/neuron#2995

[Keith-CY]

[email protected]

[devchenyan]

fixed: nervosnetwork/neuron#3118