[PM-22320] Default to SHA1 on 2fas importer if algorithm is missing (#5875)

authenticator/src/main/kotlin/com/bitwarden/authenticator/data/platform/manager/imports/parsers/TwoFasExportParser.kt

@@ -74,7 +74,8 @@ class TwoFasExportParser : ExportParser() {
                         entry.name.equals(other = algorithm, ignoreCase = true)
                     }
             }
-            ?: throw IllegalArgumentException("Unsupported algorithm: ${otp.algorithm}.")
+            // Default to SHA1 if not specified
+            ?: AuthenticatorItemAlgorithm.SHA1
 
         return AuthenticatorItemEntity(
             id = UUID.randomUUID().toString(),