Store floating point number without decimal places.

Co-authored-by: Hidde Beydals <hiddeco@users.noreply.github.com>
Signed-off-by: Felix Fontein <felix@fontein.de>

stores/flatten.go

@@ -278,7 +278,7 @@ func EncodeNonStrings(m map[string]interface{}) {
 		// The JSON unserializer treats every number as a float, so the above 'if'
 		// never applies in that situation.
 		if vFloat, ok := v.(float64); ok {
-			m["shamir_threshold"] = fmt.Sprintf("%g", vFloat)
+			m["shamir_threshold"] = fmt.Sprintf("%.0f", vFloat)
 		}
 	}
 }