fix: avoid newer JS syntax to support old Safari

[nolanlawson]

Fixes #379

Avoids breaking old browsers by avoiding the optional chaining (?.) syntax.

[github-actions]

📊 Tachometer Benchmark Results

Summary

benchmark-total

• emoji-picker-element-database-interactions: unsure 🔍 -2% - +2% (-2.11ms - +2.22ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-first-load: unsure 🔍 -3% - +4% (-1.33ms - +1.80ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-second-load: unsure 🔍 -5% - +3% (-1.95ms - +1.23ms)
  ^{this-change vs tip-of-tree}

Results

emoji-picker-element-database-interactions

• Browser: chrome-headless 119.0.6045.159
• Sample size: 50
• Built by: Benchmarks #295

• Commit: 4b9a348

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	89.21ms - 92.13ms	-	unsure 🔍 -2% - +2% -2.11ms - +2.22ms
tip-of-tree tip-of-tree	89.02ms - 92.21ms	unsure 🔍 -2% - +2% -2.22ms - +2.11ms	-

emoji-picker-element-first-load

• Browser: chrome-headless 119.0.6045.159
• Sample size: 50
• Built by: Benchmarks #295

• Commit: 4b9a348

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	41.90ms - 44.25ms	-	unsure 🔍 -3% - +4% -1.33ms - +1.80ms
tip-of-tree tip-of-tree	41.81ms - 43.87ms	unsure 🔍 -4% - +3% -1.80ms - +1.33ms	-

emoji-picker-element-second-load

• Browser: chrome-headless 119.0.6045.159
• Sample size: 50
• Built by: Benchmarks #295

• Commit: 4b9a348

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	40.14ms - 42.24ms	-	unsure 🔍 -5% - +3% -1.95ms - +1.23ms
tip-of-tree tip-of-tree	40.35ms - 42.74ms	unsure 🔍 -3% - +5% -1.23ms - +1.95ms	-

_{tachometer-reporter-action v2 for Benchmarks}

[github-actions]

Size Change: -21 B (0%)

Total Size: 42.8 kB

Filename	Size	Change
./bundle.js	42.8 kB	-21 B (0%)

_{compressed-size-action}

[nolanlawson]

Oops, forgot this was only added for the svelte.js build... need something else to actually fix #379.