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Fix #3347: "Run Code" reloads page in Matlab Problem

Instead of refreshing only the necessary parts,
"Run Code" reloads the whole page.

This commit fixes this behaviour, by refreshing the
specific elements belonging to the Problem instead.

Also tidies up indentation.
Merge pull request #3585 from dragonfi/master

Fix #3347: "Run Code" reloads page in Matlab Problem