python3: Fix style for Linuxbrew
python3: Fix style for Linuxbrew

Fix: Inconsistent indentation detected.

rwhogg/homebrew-core,Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core