fix(@uppy/locales): repair smart_count placeholder in ja_JP folderAdded

[greymoth-jp]

folderAdded in the Japanese locale writes the count placeholder as % {smart_count} (with a space) instead of %{smart_count}. Uppy's Translator (in @uppy/utils) builds the interpolation regex from the exact %{arg} token, so the extra space stops the substitution and the message shows the literal text % {smart_count} rather than the file count.

Every other use of the placeholder in this file is %{smart_count} (20 of them), and the en_US source is Added %{smart_count} file(s) from %{folder}. This removes the stray space in both plural forms.

[changeset-bot]

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