miniconda: update livecheck

[samford]

Important: Do not tick a checkbox if you haven’t performed its action. Honesty is indispensable for a smooth review process.

In the following questions <cask> is the token of the cask you're submitting.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
• brew style --fix <cask> reports no offenses.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• Checked the cask was not already refused (add your cask's name to the end of the search field).
• brew audit --cask --new <cask> worked successfully.
• HOMEBREW_NO_INSTALL_FROM_API=1 brew install --cask <cask> worked successfully.
• brew uninstall --cask <cask> worked successfully.

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The existing livecheck block for miniconda contains a #strategy call but it doesn't specify a strategy symbol. We expect the symbol to always be provided when #strategy is used but we enforce this using a RuboCop and the livecheck block RuboCops don't apply to casks yet (I'm currently working on this).

This adds the missing #strategy symbol and renames the strategy block argument to use the standard page name for PageMatch.