Heatmap flag is duplicated

Dear IBM Team,

let me know if i can provide more info. Great work and ty


```console
 vision deployed-models infer --heatmap=true --annotatefile=./annotated.png --id=59331edb-0206-4724-b9d4-b2f18b0c24c8 ./path/to/file 

# returns
Duplicate flags detected -- ['--heatmap']
```