Remove redundant context from AztecDynamicImageSpan

[khaykov]

Fix

It looks like the context in AztecDynamicImageSpan was never used, but we still pass it from all the spans that are based on AztecDynamicImageSpan. This is a vector for memory leaks, so I'm removing it.

Test

1. Make sure the app builds, and all the spans look normal.
2. Make sure the changes make sense.

Make sure strings will be translated:

• If there are new strings that have to be translated, I have added them to the client's strings.xml as a part of the integration PR.

[zwarm]

Great find @khaykov 👏

I tested according to instructions, as well as two devices side-by-side (this branch and trunk). No differences in behavior. 👍