Unbind screenshot connection even if the binding attempt fails

Bug: 273563486
Test: manual, by forcing the bindServiceAsUser method to return false
for screenshots after connecting. we do get spurious logs in that case
before the fix, but not after.

Change-Id: Ic729a3aad9dc7f7a6c396746c6c8ae706384fb5f

core/java/com/android/internal/util/ScreenshotHelper.java

@@ -195,6 +195,8 @@ public class ScreenshotHelper {
                         UserHandle.CURRENT)) {
                     mScreenshotConnection = conn;
                     handler.postDelayed(mScreenshotTimeout, timeoutMs);
+                } else {
+                    mContext.unbindService(conn);
                 }
             } else {
                 Messenger messenger = new Messenger(mScreenshotService);