expvar: fix map key output
To create a valid JSON string, "%s" is not enough. Fixes #7761. LGTM=bradfitz R=golang-codereviews, bradfitz CC=golang-codereviews https://golang.org/cl/86730043
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To create a valid JSON string, "%s" is not enough. Fixes #7761. LGTM=bradfitz R=golang-codereviews, bradfitz CC=golang-codereviews https://golang.org/cl/86730043