Git clone tests seems to fail now

I have not much time until 2 weeks. I will look at tests since I test clone manually and it worked but I must have forget one corner case.

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The diff coverage is 37.25%.

@@           Coverage Diff            @@
##             master   #4886   +/-   ##
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  Coverage          ?   37.5%           
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  Files             ?     310           
  Lines             ?   45929           
  Branches          ?       0           
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  Hits              ?   17226           
  Misses            ?   26232           
  Partials          ?    2471

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I found the stupid mistake I made. 😑
This PR should be good.

Both hooks command also need to use api/internal.

@lunny I will have to verify but hook seems to only use const in models and already use private (api/internal).
We could drop https://github.com/go-gitea/gitea/blob/master/cmd/hook.go#L69 that shouldn't be needed anymore but that will be in another PR.

@sapk Another PR to remove that is good.