Fix objc colon getting extra spaces after ternary

[PoeticPete]

(Please review #4307 first. That will eliminate most of the changes in this stacked PR.)

Fixes #4309

The following gets incorrectly formatted

static void func() {
    true ? [Foo test:@""] : @"bar";
}

static void func() {
    true ? [Foo test : @""] : @"bar";
}

cfg

sp_cond_colon                   = force
align_oc_msg_colon_span         = 1
indent_columns                  = 4
indent_with_tabs                = 0
indent_ternary_operator         = 2

This PR fixes the extra spaces added around the objc colon by preventing colons inside brackets from getting labeled as COND_COLON.