bump-formula-pr: Only delete Linux bottle line if it exists #7035
- We have some Linux-only formulae that don't have bottles. - Previously, bumping a Linux-only formula that didn't have a bottle line - eg, `adoptopenjdk` which is `bottle :unneeded` - would fail: ``` Error: inreplace failed /app/linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/adoptopenjdk.rb: expected replacement of /^ sha256 ".+" => :x86_64_linux\n/m with "\2" ```
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