MXCryptoSecretStorageTests: Have a mix of padded and unpadded Base64 strings
MXCryptoSecretStorageTests: Have a mix of padded and unpadded Base64 strings

to raise the bug described at https://github.com/vector-im/element-ios/issues/3667
matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk