Fix flaky test rest query query internal field

[mtrezza]

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Issue Description

Fix flaky test rest query query internal field.

parse-server/spec/RestQuery.spec.js

Line 195 in 453a987

it('query internal field', async () => {

The test is currently in the flaky test list:

parse-server/spec/support/CurrentSpecReporter.js

Lines 15 to 16 in 9fd7070

	// Unhandled promise rejection: TypeError: message.split is not a function
	"rest query query internal field",

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