Fix regression in wrapMultilineStatementBraces rule from bad isStartOfClosure result

[calda]

This PR fixes a regression in wrapMultilineStatementBraces that appears to be caused by 71a08dd.

On develop, code like this:

extension Foo {
    public func testWithWhereClause<A, B, Outcome>(
        a: A,
        b: B)
        -> Outcome where
        Outcome == (A, B)
    {
        return (a, b)
    }
}

is currently being reformatted to:

extension Foo {
    public func testWithWhereClause<A, B, Outcome>(
        a: A,
        b: B)
        -> Outcome where
        Outcome == (A, B) {
            return (a, b)
       }
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.02%. Comparing base (be3df7b) to head (9df2644).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1896      +/-   ##
===========================================
+ Coverage    94.83%   95.02%   +0.19%     
===========================================
  Files          135      135              
  Lines        19278    19274       -4     
===========================================
+ Hits         18282    18316      +34     
+ Misses         996      958      -38     

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