fix: remove accidental indentation from shell config template strings #435
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Fixes #422
The template strings (bashExtraText, powerExtraText, batchExtraText) had 2-space indentation inherited from TypeScript code formatting. This indentation was written to shell config files like .xonshrc, breaking xonsh's Python-based syntax.
Refactored to use array.join() pattern which is immune to auto-formatter indentation changes.