Fix initial table headers missing style

[luizyao]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fix issue: #953

When create table with initial "headers" and "header style":

• If header is a string or a non-style Column object, instead by "header style" above.

table = Table("DATE", Column(_index=1, header="NAME"), header_style="bold red")
table.add_column("AGE")

• If header is a style Column object, keep its own style.

table = Table(
        "DATE",
        Column(_index=0, header="NAME", header_style="bold green"),
        header_style="bold red",
    )
table.add_column("AGE")

[codecov]

Codecov Report

Merging #954 (dcbd038) into master (8d78671) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #954   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files          58       58           
  Lines        5069     5069           
=======================================
  Hits         5046     5046           
  Misses         23       23           

Flag	Coverage Δ
unittests	99.54% <ø> (ø)

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[willmcgugan]

Thanks, but I had already fixed this. Please try v9.9.0