fix old backups not being deleted

Author: az4521

app/src/main/java/eu/kanade/tachiyomi/data/backup/full/FullBackupManager.kt

@@ -84,7 +84,7 @@ class FullBackupManager(context: Context) : AbstractBackupManager(context) {
 
                     // Delete older backups
                     val numberOfBackups = numberOfBackups()
-                    val backupRegex = Regex("""tachiyomi_\d+-\d+-\d+_\d+-\d+.proto.gz""")
+                    val backupRegex = Regex("""tachiyomi_full_\d+-\d+-\d+_\d+-\d+.proto.gz""")
                     dir.listFiles { _, filename -> backupRegex.matches(filename) }
                         .orEmpty()
                         .sortedByDescending { it.name }