Bug fix.

Chapter 04:
- The `getHueHistogram()` function should contains 2 parameters.
The original one is simply the copy of getHistogram();
- `Finder.cpp` contains redundant code, which are useless and can be
eliminated.

Chapter 09:
- The `remap()` function doesn't need the scope specifier in the header file.

Chapter 10:
- In case the input is a camera, set its frame rate and codecs with default hard-coded values.