bug/1916 fix keys with ":" cannot be found

[JoernBerkefeld]

PR details

What changes did you make? (Give an overview)

• closes [BUG] deleting dataExtensionField with ":" in name does not work #1916

Further details (optional)

...

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• test scripts updated
• Wiki updated (if applicable)

[github-actions]

Coverage Report

Commit:ba70eae
Base: develop@dfb82fb

Type	Base	This PR
Total Statements Coverage	69.69%	69.67%  (-0.02%)
Total Branches Coverage	68.98%	68.96%  (-0.02%)
Total Functions Coverage	81.87%	81.87%  (+0%)
Total Lines Coverage	69.69%	69.67%  (-0.02%)

Details (changed files):

File	Statements	Branches	Functions	Lines
lib/index.js	71.14%	64.52%	72.72%	71.14%