texstudio: support apple silicon

[zyoshoka]

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.
• Checked the cask is submitted to the correct repo.
• 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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#168821

[zyoshoka]

@SMillerDev Since app_suffix is defined before version, #{version} will be empty and does not work. I think the workaround is using on_arm.

[daeho-ro]

Someone have to look at this and fix the version order issue.

[niu541412]

Exchange the orders of 'version' and 'app_suffix' to fix the undefined variable.

[bevanjkay]

I think that given how messy this cask is, using on_{arch} blocks makes most sense.
The arch declaration and on_arch_conditionals are designed to make the file easier to parse, and easier to maintain, which in this case I don't think was achieved by using them.
We should be good to go here now.