[Qt] style-police, add missing license headers

- add missing license headers in Mac files
- small code formating cleanups

src/qt/bitcoinamountfield.cpp

@@ -14,8 +14,10 @@
 #include <QKeyEvent>
 #include <qmath.h> // for qPow()
 
-BitcoinAmountField::BitcoinAmountField(QWidget *parent):
-        QWidget(parent), amount(0), currentUnit(-1)
+BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
+    QWidget(parent),
+    amount(0),
+    currentUnit(-1)
 {
     amount = new QDoubleSpinBox(this);
     amount->setLocale(QLocale::c());