Fixed Camera capture crash on API <= 19.

On older versions of Android, TextureView#getBitmap() needs to be called
on the main thread. On mid range phones, this is ~50ms. Normally that'd
be bad, but the UI isn't doing anything at that point anyway.

Fixes #8232

src/org/thoughtcrime/securesms/camera/Camera1Fragment.java

@@ -193,12 +193,12 @@ public class Camera1Fragment extends Fragment implements TextureView.SurfaceText
     shutterSound.play();
     orderEnforcer.reset();
 
+    Stopwatch fastCaptureTimer = new Stopwatch("Fast Capture");
+
+    Bitmap preview = cameraPreview.getBitmap();
+    fastCaptureTimer.split("captured");
+
     LifecycleBoundTask.run(getLifecycle(), () -> {
-      Stopwatch fastCaptureTimer = new Stopwatch("Fast Capture");
-
-      Bitmap preview = cameraPreview.getBitmap();
-      fastCaptureTimer.split("captured");
-
       Bitmap full = preview;
       if (Build.VERSION.SDK_INT < 28) {
         PointF scale  = getScaleTransform(cameraPreview.getWidth(), cameraPreview.getHeight(), properties.getPreviewWidth(), properties.getPreviewHeight());