fix: remaining review items — prefix in trailing SQL, dead code, indent

- DatabaseImporter: apply #__ prefix replacement on trailing statement
  (was missing for SQL not terminated by semicolon)
- SteppedBackupEngine: remove unused DatabaseDumper instantiation
- SteppedBackupEngine: fix misaligned indentation in stepDatabase()

source/packages/com_mokosuitebackup/src/Engine/DatabaseImporter.php

@@ -107,6 +107,8 @@ class DatabaseImporter
 			$remaining = trim($currentStatement);
 
 			if (!empty($remaining)) {
+				$remaining = str_replace('#__', $prefix, $remaining);
+
 				try {
 					$db->setQuery($remaining);
 					$db->execute();

source/packages/com_mokosuitebackup/src/Engine/SteppedBackupEngine.php

@@ -220,8 +220,7 @@ class SteppedBackupEngine
 		$db    = Factory::getDbo();
 
 		// Dump this single table
-		$dumper = new DatabaseDumper([]);
-		$sql    = $this->dumpSingleTable($db, $table);
+		$sql = $this->dumpSingleTable($db, $table);
 
 		// Append to a temp SQL file that will be added to ZIP in finalize
 		$sqlFile = $session->archivePath . '.sql';
@@ -234,8 +233,9 @@ class SteppedBackupEngine
 				. "SET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\n"
 				. "SET time_zone = \"+00:00\";\n\n";
 			if (file_put_contents($sqlFile, $header) === false) {
-			throw new \RuntimeException('Cannot write SQL dump: ' . $sqlFile);
-		}
+				throw new \RuntimeException('Cannot write SQL dump: ' . $sqlFile);
+			}
+
 			$flags = FILE_APPEND;
 		}