accounts/abi: Work around the uin64 conversion issue

les/utils/expiredvalue.go

@@ -92,7 +92,10 @@ func (e *ExpiredValue) Add(amount int64, logOffset Fixed64) int64 {
 		e.Exp = integer
 	}
 	if base >= 0 || uint64(-base) <= e.Base {
-		e.Base += uint64(base)
+		// This is a temporary fix to circumvent a golang
+		// uint conversion issue on arm64, which needs to
+		// be investigated further. FIXME
+		e.Base = uint64(int64(e.Base) + int64(base))
 		return amount
 	}
 	net := int64(-float64(e.Base) / factor)

les/utils/expiredvalue_test.go

@@ -16,7 +16,9 @@
 
 package utils
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestValueExpiration(t *testing.T) {
 	var cases = []struct {