Fix skipping the first trace item when handling a PHP error

[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

When a trace gets inside error handler closure, PHP uses "file" and "line" where the error occurred, but "function", "class", "type" and "args" from the closure. See example:

Array
(
    [file] => /projects/yiisoft/yii-dev-tool/dev/error-handler/tests/ErrorHandlerTest.php
    [line] => 107
    [function] => {closure:Yiisoft\ErrorHandler\ErrorHandler::register():127}
    [class] => Yiisoft\ErrorHandler\ErrorHandler
    [type] => ->
    [args] => Array
        (
            [0] => 2
            [1] => Undefined array key "undefined"
            [2] => /projects/yiisoft/yii-dev-tool/dev/error-handler/tests/ErrorHandlerTest.php
            [3] => 107
        )

)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.78%. Comparing base (20e9432) to head (5162997).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #160   +/-   ##
=========================================
  Coverage     80.78%   80.78%           
  Complexity      215      215           
=========================================
  Files            20       20           
  Lines           666      666           
=========================================
  Hits            538      538           
  Misses          128      128           

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