[bug] useLightning remove double space

[MichaelWheeley]

What does this PR do?

per #993 (review)
remove double space

Type of change

• Bug fix
• New feature
• Performance improvement
• Refactor / code cleanup
• Documentation
• Translation
• Map layer plugin

Checklist

• App loads without console errors
• Tested in Dark, Light, and Retro themes
• Responsive at different screen sizes (desktop + mobile)
• If touching server.js: caches have TTLs and size caps (we serve 2,000+ concurrent users)
• If adding an API route: includes caching and error handling
• If adding a panel: wired into Modern, Classic, and Dockable layouts
• No hardcoded colors — uses CSS variables (var(--accent-cyan), etc.)
• No .bak, .old, console.log debug lines, or test scripts included

[accius]

Confirmed this is a correct one-character cleanup. distStr is built with a leading space already ( (${PROXIMITY_RADIUS_KM} km)), so the prior nearbyStrikes')} ${distStr} rendered a double space. Dropping the literal space matches the sibling usage at lines 848-851, where distStr is concatenated directly without an extra space.

Low risk, no functional change beyond the visible header text, CI is green. Looks good to me.

— K0CJH