patch 9.0.0215: not passing APC_INDENT flag

Problem:    Not passing APC_INDENT flag.
Solution:   Pass the flag where it's needed.
diff --git a/src/indent.c b/src/indent.c
index d941abc..d7a2e55 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -797,7 +797,8 @@
 	    // the old indent, when decreasing indent it behaves like spaces
 	    // were deleted at the new indent.
 	    adjust_prop_columns(curwin->w_cursor.lnum,
-			  added > 0 ? old_offset : (colnr_T)ind_len, added, 0);
+				  added > 0 ? old_offset : (colnr_T)ind_len,
+				  added, APC_INDENT);
 	}
 #endif
 	retval = TRUE;