Fix missing spacing between average values in Day to Day report

[petervanrijt]

Summary

• Added non-breaking spaces ( ) between Carbs average, Protein average, and Fat average values in the insulin distribution summary section
• Previously these three values were displayed concatenated without any separation, making them difficult to read (e.g., "120gProtein average:45gFat average:30g")
• Now displays correctly with proper spacing (e.g., "Carbs average: 144g Protein average: 0g Fat average: 0g")

Changes

• lib/report_plugins/daytoday.js lines 118-120: Added   after Carbs and Protein average values

Test plan

• Open Nightscout Reports
• Select "Day to day" report
• Enable "Insulin distribution" checkbox
• Click SHOW to generate report
• Verify that Carbs average, Protein average, and Fat average values at the bottom are properly spaced apart

Screenshot before

Before: Values are concatenated without spacing