TextView: Fix FBC size breakage, take 2

Double checked BeOS R5 & Haiku R1/A4 and BTextView should be 356
bytes, somewhere since then we've added 4 bytes. So, this commit
reduces the class size from 360 back to 356 by removing 1 reserved
int32 (instead of 2).

I believe the class size changed in hrev46798 as a result of adding
2 bools (1 byte each padded out to 4 bytes).

Sorry for the noise.

headers/os/interface/TextView.h

@@ -460,7 +460,7 @@ private:
 			bool				fInstalledSelectOptionLinewiseShortcuts;
 			bool				fInstalledSelectHomeEndDocwiseShortcuts;
 
-			uint32				_reserved[6];
+			uint32				_reserved[5];
 };
 
 #endif	// _TEXTVIEW_H