Nuking input params in manifest does not delete default params in action

When the action has params defined as inputs in the manifest file, deleting all params won't work and the action still get them in the `params` object in main function. You have to `aio app undeploy` and then run the app again so that they won't exist anymore.

This error only happens when nuking all params. Assuming you have A and B as inputs:
* remove A: action params contain B ✔️
* remove A, add C: action params contain B and C ✔️
* remove A and B: action params contain A and B ✖️

However, action hot reload (auto deployment upon file save) does not pick up the changes in any of the above cases.

**To Reproduce**
Steps to reproduce the behavior:
1. `aio app init myapp`, populate your own .env
2. add a param `a` to inputs of the action in manifest, `aio app run`, check that the action get `a` in params
```
inputs:
a: 1
```
3. stop the run command, remove inputs from the action definition in manifest, `aio app run` again
4. action still get `a` in params

**Expected behavior**
Param `a` should be null in the action.