update max width for all KeyboardHelpDialogs (HelpContent); remove verticalIconSpacing, HelpContent.labelWithIcon.labelFirst; see https://github.com/phetsims/friction/issues/158
update max width for all KeyboardHelpDialogs (HelpContent); remove verticalIconSpacing, HelpContent.labelWithIcon.labelFirst; see https://github.com/phetsims/friction/issues/158

phetsims/joist,phetsims/joist,phetsims/joist