Update sdk.go

[pranavkonde]

Fix Error Message Typos

[Shubham-Rasal]

@pranavkonde nice catch!

There are other places as well where this typo might be present, like here -

akavesdk/sdk/sdk_test.go

Line 57 in 7df4a52

require.Equal(t, "sdk: encyption key length should be 32 bytes long", err.Error())

Since you are already at it, please fix these as well.

[Shubham-Rasal]

@Qweder93 tagging you for approval