UI: Fix rounding issues for advanced audio

Remove the close_float check for values that are set through the
advanced UI. If the difference of the integer was 1 this would sometimes
cause the input to be ignored.
Add rounding to values that are set through the signal system, since
casting alone will act like floor, which is not desirable in this case.

obs/adv-audio-control.cpp

@@ -194,7 +194,7 @@ void OBSAdvAudioCtrl::SourceFlagsChanged(uint32_t flags)
 void OBSAdvAudioCtrl::SourceVolumeChanged(float value)
 {
 	volume->blockSignals(true);
-	volume->setValue(int(value * 100));
+	volume->setValue(int(round(value * 100.0f)));
 	volume->blockSignals(false);
 }
 
@@ -217,8 +217,7 @@ void OBSAdvAudioCtrl::SourceMixersChanged(uint32_t mixers)
 void OBSAdvAudioCtrl::volumeChanged(int percentage)
 {
 	float val = float(percentage) / 100.0f;
-	if (!close_float(val, obs_source_get_volume(source), 0.01f))
-		obs_source_set_volume(source, val);
+	obs_source_set_volume(source, val);
 }
 
 void OBSAdvAudioCtrl::downmixMonoChanged(bool checked)