Apply ignore_unmatched option on R/C mode if explicitly set

By default, unmatched trailing token from each line is also aligned in
right and center alignment modes unlike in left alignment mode. If
ignore_unmatched option is explicitly set to 1 by user, they will be ignored
even in right/center modes.

test/basic.expected

@@ -1064,3 +1064,12 @@ aaa,   b,
 111 22 333  444 55555 6666  7  88888
 1111 2 33   444  555   66  777   8
 
+  a = 1
+ bb = 2
+ccccc
+ddd = 3
+
+    a = 1
+   bb = 2
+ccccc
+  ddd = 3