Set PdmUiButton default alignment to right

Removed manual setAlignment(Qt::AlignRight) calls for UI buttons,
as PdmUiButton now defaults to right alignment. Also removed
unused cafPdmUiButton.h includes from several files.

Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafPdmUiButton.cpp

@@ -43,7 +43,7 @@ namespace caf
 ///
 //--------------------------------------------------------------------------------------------------
 PdmUiButton::PdmUiButton()
-    : m_alignment( Qt::AlignLeft | Qt::AlignTop )
+    : m_alignment( Qt::AlignRight )
 {
 }
 
@@ -51,7 +51,7 @@ PdmUiButton::PdmUiButton()
 ///
 //--------------------------------------------------------------------------------------------------
 PdmUiButton::PdmUiButton( const QString& buttonText, const ClickCallback& callback )
-    : m_alignment( Qt::AlignLeft | Qt::AlignTop )
+    : m_alignment( Qt::AlignRight )
     , m_clickCallback( callback )
 {
     setUiName( buttonText );