[android] Fix wrong viewport on player

Force the device to have scale factor of 1, so that it won't rescale the webpage, which fixed:
1. wrong viewport on player.
2. wrong x and y positions for Shorts.

b/375224024
b/378156942

cobalt/android/apk/app/src/main/java/dev/cobalt/coat/CobaltActivity.java

@@ -120,7 +120,9 @@ protected void createContent(final Bundle savedInstanceState) {
             // Remove below if Cobalt rebase to m120+.
             "--user-level-memory-pressure-signal-params",
             // Pass javascript console log to adb log.
-            "--enable-features=LogJsConsoleMessages"
+            "--enable-features=LogJsConsoleMessages",
+            // Disable rescaling Webpage.
+            "--force-device-scale-factor=1",
           };
       CommandLine.getInstance().appendSwitchesAndArguments(cobaltCommandLineParams);