fix: fix hours float addition

7 + 6.97 = 13.969 repeating in JS because of floating point arithmetic
we round numbers to two decimal places

mod_data/timetracker/timetracker.js

@@ -48,7 +48,7 @@ function timecount() {
     document.querySelectorAll('.js-data-row').forEach(row => {
         let name = row.querySelector('.js-data-cell .name').innerText
         let hours = parseFloat(row.querySelector('.js-data-cell .hours').innerText)
-        counts[name] = (counts[name] || 0) + hours
+        counts[name] = parseFloat(((counts[name] || 0) + hours).toFixed(2))
     })
 
     // add counts to page
@@ -94,7 +94,6 @@ function exposeCSVExport(target) {
     if (document.createElement("a").download !== undefined) { // feature detection
         // Browsers that support HTML5 download attribute
         let url = URL.createObjectURL(makeCSVBlob())
-        // TODO prepend student name to filename? we can't determine if user is student or teacher though
         target.innerHTML = `<p><a class="btn btn-primary" href="${url}" download="timesheet.csv">Download CSV</a></p><p>As with the totals, this exports <b>only the entries visible in the list above</b> so use the "Entries per page" and "Search" settings to ensure you get all the data you need.</p>`
     } else {
         // Browsers that don't support HTML5 download attribute