Fix WizardCustomizeJenkins

[jtnord]

#2178 (comment)

Testing done

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[jtnord]

before this change

org.openqa.selenium.TimeoutException: Expected condition failed: waiting for org.jenkinsci.test.acceptance.po.WizardCustomizeJenkins$$Lambda/0x000001d0bb40d188@25b38203 (tried for 1 second(s) with 500 milliseconds interval)
Build info: version: '4.37.0', revision: '3c1da1e342'
System info: os.name: 'Windows 11', os.arch: 'amd64', os.version: '10.0', java.version: '21.0.1'
Driver info: driver.version: unknown
        at org.openqa.selenium.support.ui.FluentWait.timeoutException(FluentWait.java:265)
        at org.jenkinsci.test.acceptance.junit.Wait.timeoutException(Wait.java:191)
        at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:228)
        at org.jenkinsci.test.acceptance.junit.Wait.until(Wait.java:120)
        at org.jenkinsci.test.acceptance.po.WizardCustomizeJenkins.selectPlugin(WizardCustomizeJenkins.java:91)
        at core.InstallWizardTest.wizardInstallCustomPluginsTest(InstallWizardTest.java:99)

presumably something to do with the - in the plugin name interacting badly with the css selector, but well we have a stable ID for the checkbox so rather than searching the dom go directly.