Zimwiki writer: remove automatic colon prefix before internal images (#5183)

* FIX #5183 : zimwiki : remove automatic colon prefix before internal images

![](foo.png) should be converted to {{foo.png}} (relative path)
![](/foo.png] should be converted to {{/foo.png}} (absolute path)

Therefore the ':' prefix is useless and must be removed.

I never used the zimwiki, but i submitted the similar dokuwiki fix.

1. The zimwiki syntax is inspired by dokuwiki
2. The zimwiki documentation does not mention the colon character for images
3. The pandoc zimwiki writer seems to be a copy-paste for the dokuwiki writer

If the PR #5184 is applied, I think this one should be applied too.

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