webkit: Fix file mode for WebViewSandboxTest

No change to logic. This removes the 'x' permission bit from
WebViewSandboxTest.java. This is just a regular file, it doesn't need to be
executable.

Test: N/A
Bug: 266007845
Change-Id: I274e2fc3036b9e3b6a9a9d9f27012c6c4ca13061
diff --git a/tests/tests/sdksandbox/webkit/src/android/sdksandbox/webkit/cts/WebViewSandboxTest.java b/tests/tests/sdksandbox/webkit/src/android/sdksandbox/webkit/cts/WebViewSandboxTest.java
old mode 100755
new mode 100644