Reduce line spacing

[gotson]

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• [X] I have searched all issues to make sure there isn't a request for this icon.
• [X] I have searched the current library to make sure the icon doesn't already exist.
• [X] I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [X] I have followed the Material guidelines for system icons.

Tell us about your contribution.

This is based on mdiFormatLineSpacing. The icon exists in the Google Play book reader application, and is used to decrease the line spacing, alongside mdiFormatLineSpacing which is used to increase the line spacing.

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Upload the icon source.

format-line-spacing-down.svg.zip