Fix incorrect formatting for a static method invocation [GH-7524]

[junichi11]

• https://github.com/apache/netbeans/issues/7524
• Don't add an indent token when a static method invocation assigns to a variable
• Add unit tests

Example:

// Options: Continuation Indentation = 4
$test = Test::staticMethod(
        test(
            'test',
            $arg1,
            $arg2
        ),
        $arg
);

Before:

$test = Test::staticMethod(
        test(
            'test',
            $arg1,
            $arg2
        ),
        $arg
);

After:

$test = Test::staticMethod(
    test(
        'test',
        $arg1,
        $arg2
    ),
    $arg
);