[fenix] Fix Issue https://github.com/mozilla-mobile/fenix/issues/7366: Reference local android-components gradlew correctly

In `settings.gradle` when Fenix determines whether there is an
overriding local android-components it calls `gradlew` from the
`autoPublish.android-components.dir` directory. It sets the current
working directory (cwd) to `autoPublish.android-components.dir` and then
invokes `<autoPublish.android-components.dir>/gradlew`. The proper
behavior is to invoke `./gradlew` because the cwd is already set properly.

settings.gradle

@@ -54,7 +54,7 @@ if (localProperties != null) {
     if (androidComponentsLocalPath != null) {
         log("Enabling automatic publication of android-components from: $androidComponentsLocalPath")
         log("Determining if android-components are up-to-date...")
-        def compileAcCmd = ["${androidComponentsLocalPath}/gradlew", "compileReleaseKotlin"]
+        def compileAcCmd = ["./gradlew", "compileReleaseKotlin"]
         def compileOutput = runCmd(compileAcCmd, androidComponentsLocalPath, "Compiled android-components.")
         // This is somewhat brittle: parse last line of gradle output, to fish out how many tasks were executed.
         // One executed task means gradle didn't do any work other than executing the top-level 'compile' task.