Fix embroider-optimised #766

Job	Run time
discover_matrix	25s
lint-all-packages	28s
Legacy Mocha Tests - 16.x	25s
Ember Tests (16.x, ubuntu-latest)	1m 1s
Legacy Mocha Tests - 14.x	28s
Ember Tests (16.x, windows-latest)	3m 2s
Test Packages (16.x, ubuntu-latest)	1m 20s
Test Packages (16.x, windows-latest)	3m 5s
Ember Tests (14.x, ubuntu-latest)	52s
ember-try for ember-cli-fastboot: ember-lts-3.16	54s
Test Packages (14.x, ubuntu-latest)	1m 13s
Ember Tests (14.x, windows-latest)	2m 22s
ember-try for ember-cli-fastboot: ember-lts-3.20	54s
Test Packages (14.x, windows-latest)	3m 16s
ember-try for ember-cli-fastboot: ember-lts-3.24	48s
ember-try for ember-cli-fastboot: ember-lts-3.28	51s
ember-try for ember-cli-fastboot: ember-lts-4.4	43s
ember-try for ember-cli-fastboot: ember-lts-4.8	49s
ember-try for ember-cli-fastboot: ember-lts-4.12	50s
ember-try for ember-cli-fastboot: ember-lts-5.4	56s
ember-try for ember-cli-fastboot: ember-release	58s
ember-try for ember-cli-fastboot: ember-beta	58s
ember-try for ember-cli-fastboot: ember-canary	50s
ember-try for ember-cli-fastboot: embroider-safe	46s
ember-try for ember-cli-fastboot: embroider-optimized	59s
ember-try for ember-cli-fastboot: no-deprecations	42s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	45s
custom-output-paths	42s
ember-cli-fastboot	36s
fastboot-config-location	35s
fastboot-express-middleware	38s
fastboot-location	34s
fastboot-shoebox-test	39s
integration-tests	1m 14s
oneerror-per-visit	59s
request-details	35s
root-url	32s
	37m 44s

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