Fix flyteadmin port in flytectl config init

[eapolinario]

TL;DR

Fix the flyteadmin port by flytectl config init to match the one required by demo cluster

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

The flyteadmin port used in the demo cluster is 30080, so users who have rely on flytectl config init to generate a valid config file should be left with a config file that reflects that.

Tracking Issue

flyteorg/flyte#3461

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #400 (0bad2b7) into master (29da288) will increase coverage by 0.77%.
The diff coverage is 100.00%.

❗ Current head 0bad2b7 differs from pull request most recent head a295bf8. Consider uploading reports for the commit a295bf8 to get more accurate results

@@            Coverage Diff             @@
##           master     #400      +/-   ##
==========================================
+ Coverage   66.57%   67.35%   +0.77%     
==========================================
  Files         145      145              
  Lines        6271     5235    -1036     
==========================================
- Hits         4175     3526     -649     
+ Misses       1816     1429     -387     
  Partials      280      280              

Flag	Coverage Δ
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/configuration/configuration.go	78.33% <100.00%> (+1.70%)	⬆️

... and 133 files with indirect coverage changes

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