Wladimir J. van der Laan bb3de15ad8 qt: Move BitcoinGUI initializers to class, fix initializer order warning
- C++11-ize the code (move initializers to class, change 0 to `nullptr` where appropriate)
- Make sure `m_wallet_selector` is initialized
- And fix the following warning:

    bitcoin/src/qt/bitcoingui.cpp:122:5⚠️ field 'spinnerFrame' will be initialized after field 'm_wallet_selector_label' [-Wreorder]
        spinnerFrame(0),
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