CtsVerifier: Correct minor typo

The yuv image reader might never get initialized in case
both the selected preview size and the bokeh
combination preview size mismatch which can end up
causing an NPE.

Bug: 167255264
Test: Manual using CtsVerifier
Change-Id: I30a007a13466545f4f3831300e73a8ad6c9d9201
diff --git a/apps/CtsVerifier/src/com/android/cts/verifier/camera/bokeh/CameraBokehActivity.java b/apps/CtsVerifier/src/com/android/cts/verifier/camera/bokeh/CameraBokehActivity.java
index 7365b32..78f41da 100644
--- a/apps/CtsVerifier/src/com/android/cts/verifier/camera/bokeh/CameraBokehActivity.java
+++ b/apps/CtsVerifier/src/com/android/cts/verifier/camera/bokeh/CameraBokehActivity.java
@@ -753,7 +753,7 @@
 
     private void startPreview() {
         try {
-            if (mPreviewSize == null || mPreviewSize.equals(mNextCombination.mPreviewSize)) {
+            if (mPreviewSize == null || !mPreviewSize.equals(mNextCombination.mPreviewSize)) {
                 mPreviewSize = mNextCombination.mPreviewSize;
 
                 mYuvImageReader = ImageReader.newInstance(mPreviewSize.getWidth(),