#1689: fix misleading message in set-version when version is already installed

[Ali-Shariati-Najafabadi]

This PR fixes #1689

Implemented changes

• Updated setVersion method in ToolCommandlet.java to check if the
  requested version is already installed before showing the install hint
• If version is already installed: show confirmation message instead of
  misleading install instruction

Checklist for this PR

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary»
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled with internal

[CLAassistant]

All committers have signed the CLA.

[coveralls]

Coverage Report for CI Build 28236116824

Coverage increased (+0.03%) to 71.39%

Details

• Coverage increased (+0.03%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 14 coverage regressions across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

14 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/tool/ToolCommandlet.java	14	73.87%

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Coverage Stats

Relevant Lines:	16276
Covered Lines:	12115
Line Coverage:	74.43%
Relevant Branches:	7286
Covered Branches:	4706
Branch Coverage:	64.59%
Branches in Coverage %:	Yes
Coverage Strength:	3.15 hits per line

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💛 - Coveralls