Update the root project name check in `publish.gradle`

The name was changed in https://github.com/google/ExoPlayer/commit/052c358dcd01481c3d1e2f9bec26775fcc2b04ba
and this check wasn't updated, meaning publishing no longer worked
(it didn't publish anything, just printed lots of warnings like
`Skipping task ':test-utils-robolectric:publish' as it has no
actions.`). This change means the check is now using the same
source-of-truth as the root project name, so it shouldn't go out of
sync again.

#minor-release

PiperOrigin-RevId: 531457952

core_settings.gradle

@@ -21,6 +21,8 @@ def modulePrefix = ':'
      modulePrefix += gradle.ext.exoplayerModulePrefix
  }
 
+ rootProject.name = 'exoplayer2'
+
 include modulePrefix + 'library-common'
 project(modulePrefix + 'library-common').projectDir = new File(rootDir, 'library/common')
 

settings.gradle

@@ -18,8 +18,6 @@ def modulePrefix = ':'
      modulePrefix += gradle.ext.exoplayerModulePrefix
  }
 
- rootProject.name = 'exoplayer2'
-
 include modulePrefix + 'demo'
 project(modulePrefix + 'demo').projectDir = new File(rootDir, 'demos/main')
 include modulePrefix + 'demo-cast'