camera2/3: set preview callback oneshot flag during still capture

Preview callback oneshot flag need set when a still picture is being captured
and preview callback oneshot is enabled, otherwise, the callback enabling status
could be lost when preview is restarted after still catpure.

Bug 9742091

Change-Id: If9562369013e53727edfdd16f3d00d6a9392e70d
diff --git a/services/camera/libcameraservice/Camera2Client.cpp b/services/camera/libcameraservice/Camera2Client.cpp
index 16688cf..6942006 100644
--- a/services/camera/libcameraservice/Camera2Client.cpp
+++ b/services/camera/libcameraservice/Camera2Client.cpp
@@ -616,6 +616,7 @@
         case Parameters::STOPPED:
         case Parameters::WAITING_FOR_PREVIEW_WINDOW:
         case Parameters::PREVIEW:
+        case Parameters::STILL_CAPTURE:
             // OK
             break;
         default: