refactor: unsafe encoding assumes default options

[alandefreitas]

The private unsafe encoding functions received a parameter to determine the encoding options. However, these functions are never used in any context where these options should diverge from the default values.

This is a partial solution to https://github.com/boostorg/url/issues/828, where detail/encode.hpp is the file with the lowest coverage.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.59%. Comparing base (6ec189b) to head (a1a5760).

Additional details and impacted files

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LCOV code coverage report https://831.url.prtest2.cppalliance.org/genhtml/index.html Coverage Diff https://831.url.prtest2.cppalliance.org/gcovr/coverage_diff.txt