clicksend:// authentication bugfix

[caronc]

Description:

Related issue (if applicable): #1103

Previous to this merge request, clicksend://user:apikey did not work correctly

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@1103-clicksend-authfix

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "clicksend://user:apikey@..."

[codecov-commenter]

Codecov Report

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

Project coverage is 99.28%. Comparing base (fcd70ff) to head (006c5fe).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1121 +/- ## ======================================= Coverage 99.28% 99.28% ======================================= Files 139 139 Lines 18066 18067 +1 Branches 3689 3690 +1 ======================================= + Hits 17936 17937 +1 Misses 121 121 Partials 9 9 ```

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