Part 2 of fix, make sure copied slopes also pass on hasslope status to attached target sectors for FOFs

Also fix whitespace to use tab-style spaces instead of regular spaces, ew

src/p_slopes.c

@@ -600,6 +600,11 @@ void P_CopySectorSlope(line_t *line)
 
 	fsec->hasslope = true;
 
+	// if this is an FOF control sector, make sure any target sectors also are marked as having slopes
+	if (fsec->numattached)
+		for (i = 0; i < fsec->numattached; i++)
+			sectors[fsec->attached[i]].hasslope = true;
+
 	line->special = 0; // Linedef was use to set slopes, it finished its job, so now make it a normal linedef
 }