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mbox: fix %[ formatting (thanks phil9)

--- a/mbox.c

+++ b/mbox.c

@@ -544,6 +544,7 @@

 			printw(bp, m->replyto, width);

 			break;

 		case '[':

+			p++;

 			if((e = strchr(p, ']')) == nil)

 				sysfatal("missing closing '}' in %%{");

 			if(e - p >= sizeof(buf) - 1)