Hardcoded extension name in ext_emconf.php

[igodorogea]

This line prevents the extension to be installed with composer
https://github.com/lochmueller/google_services/blob/master/ext_emconf.php#L13

- Installing typo3-ter/google-services (1.0.3)
    Downloading: 100%
    Extracting archive


  [ErrorException]
  Undefined index: 258b3bff


Exception trace:
 () at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/Downloader/T3xDownloader.php:123
 Composer\Util\ErrorHandler::handle() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/Downloader/T3xDownloader.php:123
 TYPO3\CMS\Composer\Installer\Downloader\T3xDownloader->getEmConfMetaData() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/Downloader/T3xDownloader.php:246
 TYPO3\CMS\Composer\Installer\Downloader\T3xDownloader->writeEmConf() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/Downloader/T3xDownloader.php:70
 TYPO3\CMS\Composer\Installer\Downloader\T3xDownloader->extract() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Downloader/ArchiveDownloader.php:43
 Composer\Downloader\ArchiveDownloader->download() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/Downloader/T3xDownloader.php:50
 TYPO3\CMS\Composer\Installer\Downloader\T3xDownloader->download() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Downloader/DownloadManager.php:213
 Composer\Downloader\DownloadManager->download() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/ExtensionInstaller.php:191
 TYPO3\CMS\Composer\Installer\ExtensionInstaller->installCode() at /var/www/vhosts/localhost/vendor/typo3/cms-composer-installers/Classes/TYPO3/CMS/Composer/Installer/ExtensionInstaller.php:123
 TYPO3\CMS\Composer\Installer\ExtensionInstaller->install() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Installer/InstallationManager.php:152
 Composer\Installer\InstallationManager->install() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Installer/InstallationManager.php:139
 Composer\Installer\InstallationManager->execute() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Installer.php:569
 Composer\Installer->doInstall() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Installer.php:228
 Composer\Installer->run() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Command/UpdateCommand.php:173
 Composer\Command\UpdateCommand->execute() at phar:///var/www/vhosts/localhost/composer.phar/vendor/symfony/console/Command/Command.php:259
 Symfony\Component\Console\Command\Command->run() at phar:///var/www/vhosts/localhost/composer.phar/vendor/symfony/console/Application.php:844
 Symfony\Component\Console\Application->doRunCommand() at phar:///var/www/vhosts/localhost/composer.phar/vendor/symfony/console/Application.php:192
 Symfony\Component\Console\Application->doRun() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Console/Application.php:166
 Composer\Console\Application->doRun() at phar:///var/www/vhosts/localhost/composer.phar/vendor/symfony/console/Application.php:123
 Symfony\Component\Console\Application->run() at phar:///var/www/vhosts/localhost/composer.phar/src/Composer/Console/Application.php:99
 Composer\Console\Application->run() at phar:///var/www/vhosts/localhost/composer.phar/bin/composer:43
 require() at /var/www/vhosts/localhost/composer.phar:25