cooper/quiki: wiki/category.go; 6 LoC

Found a possible issue in [cooper/quiki](https://www.github.com/cooper/quiki) at [wiki/category.go](https://github.com/cooper/quiki/blob/13ef0152765747bc1ff667ee7958dec4bb0a904c/wiki/category.go#L534-L539)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> reference to modelInfo is reassigned at line 537

[Click here to see the code in its original context.](https://github.com/cooper/quiki/blob/13ef0152765747bc1ff667ee7958dec4bb0a904c/wiki/category.go#L534-L539)

Click here to show the 6 line(s) of Go which triggered the analyzer.

```go
for modelName, modelInfo := range page.Models {
modelCat := w.GetSpecialCategory(modelName, CategoryTypeModel)
modelCat.Preserve = true // keep until there are no more references
modelCat.ModelInfo = &modelInfo
modelCat.AddPage(w, page)
}

```

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commit ID: 13ef0152765747bc1ff667ee7958dec4bb0a904c