TextView: Fix FBC size breakage

In hrev46796 I added two new private methods: _PreviousLineStart(),
and _NextLineEnd() which increased the size of the class breaking
binary compatability because I forgot to decrement the reserved array.

This commit decrements the reserved array restoring the class size
to the original size fixing the binary compat issue.

Thanks Axel for noticing.

headers/os/interface/TextView.h

@@ -460,7 +460,7 @@ private:
 			bool				fInstalledSelectOptionLinewiseShortcuts;
 			bool				fInstalledSelectHomeEndDocwiseShortcuts;
 
-			uint32				_reserved[6];
+			uint32				_reserved[4];
 };
 
 #endif	// _TEXTVIEW_H