Improved logging for improper usage entries

Hi.

In reviewing calls that trigger wrong usage entries, the entry was not useful in locating where the usage originated. I made a quick change that directly indicates the offending location in the code. There may be a better way to format the loop, but this did the trick for me to isolate the precise location.

function log_wrong( $function, $message, $version ) {
	$backtrace = debug_backtrace();
	$deprecated = $function . '()';
	foreach ( $backtrace as $frame) {
		if ( $frame['function'] != $function ) {
			continue;
		}
		$in_file = $this->strip_abspath( $frame['file'] );
		$on_line = $frame['line'];
		break;
	}
	if ( ! isset( $in_file ) ) {
		$in_file = $this->strip_abspath( $backtrace[ 4 ]['file'] );
		$on_line = $backtrace[ 4 ]['line'];
	}
	$this->log( 'wrong', compact( 'deprecated', 'message', 'version', 'in_file', 'on_line' ) );
}

I wasn’t sure which part of the stack you were attempting to grab with $backtrace[4], for me it’s the frame that calls _doing_it_wrong.

— Ken