Avoid to fetchSignalingSettings in onMicrophoneClick

this led to duplicated call of fetchSignalingSettings.
because it's already called from checkDevicePermissions().
From my pov it shouldn't be triggered in onMicrophoneClick() again, at least i can not think of any scenario and while testing everything worked as expected.

The duplicated call was there since ever(?), but after implementing #3216 this also caused the call duration timer to be run twice.

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/activities/CallActivity.kt

@@ -1050,9 +1050,6 @@ class CallActivity : CallBaseActivity() {
             binding!!.microphoneButton.setImageResource(R.drawable.ic_mic_off_white_24px)
             toggleMedia(false, false)
         }
-        if (isVoiceOnlyCall && !isConnectionEstablished) {
-            fetchSignalingSettings()
-        }
         if (!canPublishAudioStream) {
             // In the case no audio stream will be published it's not needed to check microphone permissions
             return