Remote control outputs HTML garbish usage report

[simon04]

What steps will reproduce the problem?

1. Open ​http://localhost:8111/

What is the expected result?

What happens instead?

See screenshot

Please provide any additional information below. Attach a screenshot if possible.

Revision:17641
Is-Local-Build:true
Build-Date:2021-03-23 00:54:20

Identification: JOSM/1.5 (17641 SVN en) Mac OS X 11.2.3
OS Build number: macOS 11.2.3 (20D91)
Memory Usage: 217 MB / 2048 MB (69 MB allocated, but free)
Java version: 16+36, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.formdev.flatlaf.FlatLightLaf
Screen: Display 1 1440×900 (scaling 2,00×2,00) Display 2 3008×1692 (scaling 2,00×2,00)
Maximum Screen Size: 3008×1692
Best cursor sizes: 16×16→16×16, 32×32→32×32
VM arguments: [-agentlib:jdwp=transport=dt_socket,address=127.0.0.1:53504,suspend=y,server=n, --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, -javaagent:/Users/simon/Library/Caches/JetBrains/IntelliJIdea2020.3/captureAgent/debugger-agent.jar, -Dfile.encoding=UTF-8]

Plugins:
+ flatlaf (35703)

[simon04]

In 17656/josm:

fix #20661 - Remote control: fix usage report (HTML)

​http://localhost:8111/