`dprint init`'s `includes` does not follow common Dockerfile name

[SamuelT-Beslogic]

Describe the bug

Dockerfiles are usually named Dockerfile, most tools will work with a file named as such by default, not .dockerfile

dprint-plugin-dockerfile version: 0.3.0

Input Code

dprint init (select at least dprint-plugin-dockerfile)

Expected Output

  "includes": ["**/Dockerfile"],

Actual Output

  "includes": ["**/.{dockerfile}"],

[SamuelT-Beslogic]

Relates to #6