Fix date-range filter selections (Refs #104)

src/lib/ui/components/ActivityLog.svelte

@@ -241,14 +241,14 @@
             <label for={`activity-days${suffix}`}
                 >Date range<select
                     id={`activity-days${suffix}`}
-                    value={filters.days ?? 0}
+                    value={String(filters.days ?? 0)}
                     onchange={(event) => update({ days: event.currentTarget.value })}
                     ><option value="0">All retained history</option><option value="1"
                         >Last 24 hours</option
                     ><option value="7">Last 7 days</option><option value="30">Last 30 days</option
                     ><option value="90">Last 90 days</option
                     >{#if filters.days && ![1, 7, 30, 90].includes(filters.days)}<option
-                            value={filters.days}>Last {filters.days} days</option
+                            value={String(filters.days)}>Last {filters.days} days</option
                         >{/if}</select
                 ></label
             >

src/lib/ui/components/MatchHistory.svelte

@@ -176,7 +176,7 @@
             <label for={`match-days${suffix}`}
                 >Date range<select
                     id={`match-days${suffix}`}
-                    value={filters.days}
+                    value={String(filters.days)}
                     onchange={(event) => update({ days: event.currentTarget.value })}
                     ><option value="0">All time</option><option value="7">Last 7 days</option
                     ><option value="30">Last 30 days</option><option value="90">Last 90 days</option