Fix upload waiting for port without 1200bps touch

[silvanocerza]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

Fixes an upload bug.

• What is the current behavior?

If a platform has set upload.wait_for_upload_port property to true in the boards.txt without setting also upload.use_1200bps_touch to true the CLI waits for the port anyway even if it's not necessary.

• What is the new behavior?

upload.wait_for_upload_port property now defaults to false and is set only if upload.use_1200bps_touch is true as is documented right now: https://arduino.github.io/arduino-cli/dev/platform-specification/#1200-bps-bootloader-reset

• Does this PR introduce a breaking change, and is
  titled accordingly?

Nope.

• Other information:

Fixes #1318.

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