Set proper motif wm hints name

Just a cosmetic change as the variable is currently not in use.
According to the Motif Toolkit API and MwmUtil.h, the last long
variable from the Motif WM Hints struct is currenlty used
for the status.

src/motif.c

@@ -62,7 +62,7 @@ typedef struct {
 	long functions;
 	long decorations;
 	long inputMode;
-	long unknown;
+	long status;
 } MWMHints;
 
 static Atom _XA_MOTIF_WM_HINTS;
@@ -180,7 +180,7 @@ static int getMWMHints(Window window, MWMHints *mwmhints)
 		mwmhints->decorations = data[2];
 		mwmhints->inputMode = data[3];
 		if (count > 5)
-			mwmhints->unknown = data[4];
+			mwmhints->status = data[4];
 	}
 	XFree(data);