chore(example): minor improvement for grc20

[ltzmaxwell]

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[Gno2D2]

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[ltzmaxwell]

is this truly an improvement over the old code?

[thehowl]

merging the repeated code looks good, but I don't understand why to unexport spendAllowance

cc @moul

[moul]

Suggested change

	// spendAllowance decreases the allowance of the specified owner and spender.
	func (led *PrivateLedger) spendAllowance(owner, spender address, amount int64) error {
	// SpendAllowance decreases the allowance of the specified owner and spender.
	func (led *PrivateLedger) SpendAllowance(owner, spender address, amount int64) error {

This admin helper should be callable by an external realm.

[moul]

Please also keep the function implementation around line 82 as before to minimise the difference in the diff. This contract was already reviewed during security audits and we should aim for minimal changes now.

[moul]

See comments.