Use singular

Co-authored-by: Simon Warta <[email protected]>

lib.go

@@ -531,7 +531,7 @@ func (vm *VM) IBCPacketTimeout(
 	return &result, gasReport.UsedInternally, nil
 }
 
-func compileCosts(code WasmCode) uint64 {
+func compileCost(code WasmCode) uint64 {
 	// CostPerByte is how much CosmWasm gas is charged *per byte* for compiling WASM code.
 	// Benchmarks and numbers (in SDK Gas) were discussed in:
 	// https://github.com/CosmWasm/wasmd/pull/634#issuecomment-938056803