remove unnecessary export, fix build

[zeroXbrock]

• duplicate sig from said export was breaking module resolution

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
viem (esm)	58.15 KB (0%)	1.2 s (0%)	320 ms (-19.62% 🔽)	1.5 s
viem (cjs)	76.86 KB (0%)	1.6 s (0%)	382 ms (+3.61% 🔺)	2 s
viem (minimal surface - tree-shaking)	3.97 KB (0%)	80 ms (0%)	46 ms (+14.69% 🔺)	125 ms
viem/accounts	89.88 KB (+0.02% 🔺)	1.8 s (+0.02% 🔺)	278 ms (+135.51% 🔺)	2.1 s
viem/accounts (tree-shaking)	19.5 KB (0%)	390 ms (0%)	120 ms (+111.03% 🔺)	510 ms
viem/actions	43.43 KB (0%)	869 ms (0%)	1.6 s (-7.2% 🔽)	2.5 s
viem/actions (tree-shaking)	348 B (0%)	10 ms (0%)	52 ms (+196.56% 🔺)	62 ms
viem/chains	17.88 KB (0%)	358 ms (0%)	100 ms (+60.06% 🔺)	457 ms
viem/chains (tree-shaking)	473 B (0%)	10 ms (0%)	73 ms (+178.78% 🔺)	83 ms
viem/chains/utils	49.8 KB (+0.1% 🔺)	997 ms (+0.1% 🔺)	213 ms (+73.97% 🔺)	1.3 s
viem/chains/utils (tree-shaking)	5.26 KB (0%)	106 ms (0%)	57 ms (+3.75% 🔺)	162 ms
viem/ens	43.43 KB (0%)	869 ms (0%)	1.5 s (+8.75% 🔺)	2.3 s
viem/ens (tree-shaking)	18.01 KB (0%)	361 ms (0%)	82 ms (-15.77% 🔽)	442 ms