perf: avoid recalculating custom emoji index

[nolanlawson]

This won't show up in the benchmarks, but we do an extra recalculation of the custom emoji search index that we don't need to.

[github-actions]

📊 Tachometer Benchmark Results

Summary

benchmark-total

• emoji-picker-element-change-tab: unsure 🔍 -3% - +4% (-0.92ms - +1.53ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-database-interactions: unsure 🔍 -7% - +3% (-8.48ms - +3.67ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-first-load: unsure 🔍 -4% - +5% (-2.37ms - +2.85ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-search: unsure 🔍 -9% - +1% (-4.18ms - +0.70ms)
  ^{this-change vs tip-of-tree}
• emoji-picker-element-second-load: unsure 🔍 -4% - +3% (-1.69ms - +1.38ms)
  ^{this-change vs tip-of-tree}

Results

emoji-picker-element-change-tab

• Browser: chrome-headless 128.0.0.0
• Sample size: 50
• Built by: Benchmarks #471

• Commit: 985d225

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	33.60ms - 35.42ms	-	unsure 🔍 -3% - +4% -0.92ms - +1.53ms
tip-of-tree tip-of-tree	33.39ms - 35.03ms	unsure 🔍 -4% - +3% -1.53ms - +0.92ms	-

emoji-picker-element-database-interactions

• Browser: chrome-headless 128.0.0.0
• Sample size: 50
• Built by: Benchmarks #471

• Commit: 985d225

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	107.42ms - 115.55ms	-	unsure 🔍 -7% - +3% -8.48ms - +3.67ms
tip-of-tree tip-of-tree	109.37ms - 118.41ms	unsure 🔍 -3% - +8% -3.67ms - +8.48ms	-

emoji-picker-element-first-load

• Browser: chrome-headless 128.0.0.0
• Sample size: 50
• Built by: Benchmarks #471

• Commit: 985d225

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	51.32ms - 54.98ms	-	unsure 🔍 -4% - +5% -2.37ms - +2.85ms
tip-of-tree tip-of-tree	51.05ms - 54.77ms	unsure 🔍 -5% - +4% -2.85ms - +2.37ms	-

emoji-picker-element-search

• Browser: chrome-headless 128.0.0.0
• Sample size: 50
• Built by: Benchmarks #471

• Commit: 985d225

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	43.05ms - 46.51ms	-	unsure 🔍 -9% - +1% -4.18ms - +0.70ms
tip-of-tree tip-of-tree	44.80ms - 48.25ms	unsure 🔍 -2% - +9% -0.70ms - +4.18ms	-

emoji-picker-element-second-load

• Browser: chrome-headless 128.0.0.0
• Sample size: 50
• Built by: Benchmarks #471

• Commit: 985d225

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	42.84ms - 44.89ms	-	unsure 🔍 -4% - +3% -1.69ms - +1.38ms
tip-of-tree tip-of-tree	42.88ms - 45.16ms	unsure 🔍 -3% - +4% -1.38ms - +1.69ms	-

_{tachometer-reporter-action v2 for Benchmarks}

[github-actions]

Size Change: +38 B (+0.1%)

Total Size: 36.4 kB

Filename	Size	Change
./bundle.js	36.4 kB	+38 B (+0.1%)

_{compressed-size-action}