Bug in cursor_select_by_bracket

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I found a bug in cursor_select_by_bracket that surfaces when the matching bracket is greater than MLE_BRACKET_PAIR_MAX_SEARCH chars away from the cursor. The following shell script reproduces:

# Open editor with >MLE_BRACKET_PAIR_MAX_SEARCH chars of content:
#     (
#     1
#     2
#     ...
#     10000
#     )
# Then, invoking `cmd_anchor_by bracket` (`C-2 d`) inside the parenthesis causes a segfault
{ echo '('; seq 1 10000; echo ')'; } | ./mle -N -H0 -M 'a right C-2 d C-x n' -pa

Bugfix to follow.