Escape the '\' between " in the `scalac` task #32506

Job	Run time
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test	52m 37s
MiMa	11m 11s
test_windows_fast	41m 35s
community_build_a	53m 3s
test_windows_full	0s
community_build_b	1h 22m 56s
community_build_c	1h 1m 0s
test_sbt	18m 15s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	8m 13s
build-chocolatey-package / build	23s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 29m 13s

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