[Vimode] Ensure the % command (go to matching bracket) always works

For e.g. the text {|} (where | is the cursor), m_bmStart is equal to [ (0, 0) -> (0, 1) ] and the closing bracket is in (0, 1). Since m_bmStart->toRange().contains(m_cursor) is checked first, the current bracket is incorrectly set to the opening bracket {.

Mainly the vimode's % command (go to matching bracket) is affected.