BSpinner: do not redefine fValue

BSpinner had its own fValue defined instead of using the one from
BControl. This results in the be:value in the message sent when the
control is invoked to always be 0.

Change-Id: I1cff5f30adbf5b1dede57a14377cd4e1db7a30d3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7428
Reviewed-by: waddlesplash <[email protected]>

headers/private/interface/Spinner.h

@@ -45,7 +45,6 @@ public:
 			void				Range(int32* min, int32* max);
 	virtual	void				SetRange(int32 min, int32 max);
 
-			int32				Value() const { return fValue; };
 	virtual	void				SetValue(int32 value);
 	virtual	void				SetValueFromText();
 
@@ -77,10 +76,9 @@ private:
 
 			int32				fMinValue;
 			int32				fMaxValue;
-			int32				fValue;
 
 	// FBC padding
-			uint32				_reserved[20];
+			uint32				_reserved[21];
 };