Remove enable tracing from android sample manifest (#3792)

Co-authored-by: Alexander Dinauer <[email protected]>

Author: lbloder

sentry-samples/sentry-samples-android/src/main/AndroidManifest.xml

@@ -105,15 +105,14 @@
         <!--    how to change the session tracking interval-->
         <meta-data android:name="io.sentry.session-tracking.timeout-interval-millis" android:value="10000" />
 
-        <!--    how to enable the performance API by either enabling tracing or setting a sample-rate-->
-        <meta-data android:name="io.sentry.traces.enable" android:value="true" />
-<!-- how to set custom sample rate different from the default 1.0 -->
-<!--        <meta-data android:name="io.sentry.traces.sample-rate" android:value="0.8" /> -->
+        <!-- how to enable the performance API by setting a sample-rate (0.0 to 1.0) -->
+        <!-- a sample-rate of 0.0 will disable the performance API  -->
+        <meta-data android:name="io.sentry.traces.sample-rate" android:value="1.0" />
 
         <!--    how to enable profiling when starting transactions -->
         <meta-data android:name="io.sentry.traces.profiling.sample-rate" android:value="1.0" />
 
-      <!--    how to enable app start profiling -->
+        <!--    how to enable app start profiling -->
         <meta-data android:name="io.sentry.traces.profiling.enable-app-start" android:value="true" />
 
         <!--    how to disable the Activity auto instrumentation for tracing-->