Fix language id computation for JDT URIs #244

Job	Run time
language-servers-multiplatform-build / Build (ubuntu-latest)	31m 1s
language-servers-multiplatform-build / Build (macos-latest)	29m 51s
language-servers-multiplatform-build / Build (windows-latest)	38m 49s
eclipse-ls-extensions / eclipse-language-servers-build	10m 40s
vscode-concourse / Build VSCode Extension 'vscode-concourse' Snapshot	4m 12s
vscode-bosh / Build VSCode Extension 'vscode-bosh' Snapshot	4m 8s
vscode-manifest-yaml / Build VSCode Extension 'vscode-manifest-yaml' Snapshot	2m 55s
vscode-spring-boot / Build VSCode Extension 'vscode-spring-boot' Snapshot	24m 17s
eclipse-ls-extensions / notify-failure	0s
e435-distro / eclipse-distro-build	17m 53s
e433-distro / eclipse-distro-build	16m 2s
e434-distro / eclipse-distro-build	15m 59s
e434-distro / sign-osx-distros	39m 31s
e434-distro / sign-win-distros	3m 16s
e433-distro / sign-osx-distros	51m 53s
e433-distro / sign-win-distros	2m 48s
e435-distro / sign-win-distros	6m 50s
e435-distro / sign-osx-distros	50m 38s
e434-distro / cleanup	8s
e434-distro / Send GChat message	0s
e434-distro / purge_cache	0s
e434-distro / notify-failure / notify-failure	3s
e433-distro / cleanup	2s
e433-distro / purge_cache	0s
e433-distro / Send GChat message	0s
e433-distro / notify-failure	0s
e435-distro / cleanup	2s
e435-distro / Send GChat message	0s
e435-distro / purge_cache	0s
e435-distro / notify-failure	0s
	5h 50m 58s

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