fix the missing break in JumpToMatchingBrace (#1960)
fix the missing break in JumpToMatchingBrace (#1960)

In JumpToMatchingBrace, the loop should stop immediately after finding the matching bracket.
It causes multiple jumps in certain situations:
`(I  [  ]{  }) => (  I[  ]{  })`
zyedidia/micro,zyedidia/micro