Fix Lint/RedundantBegin in Template::Engine#get_template

[papilip]

The begin/end block inside Template::Engine#get_template is redundant: Crystal supports rescue directly at the block level. Removing it resolves the Lint/RedundantBegin offense (correctable) currently reported by ameba 1.7.0-dev, which fails the QA checks job.

@loaders.each do |loader|
  return loader.get_template(template_name)
rescue Errors::TemplateNotFound
end

Behaviour is unchanged. crystal tool format applied.

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