Fix variables shadowing in qt/sendcoinsdialog.cpp
Fix variables shadowing in qt/sendcoinsdialog.cpp

qt/sendcoinsdialog.cpp:127:51: warning: declaration shadows a field of 'SendCoinsDialog' [-Wshadow]
void SendCoinsDialog::setClientModel(ClientModel *clientModel)
                                                  ^
./qt/sendcoinsdialog.h:67:18: note: previous declaration is here
    ClientModel *clientModel;
                 ^
qt/sendcoinsdialog.cpp:137:45: warning: declaration shadows a field of 'SendCoinsDialog' [-Wshadow]
void SendCoinsDialog::setModel(WalletModel *model)
                                            ^
./qt/sendcoinsdialog.h:68:18: note: previous declaration is here
    WalletModel *model;
                 ^

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