Add default case to facebook::react::displayModeToInt()

[Yajur-Grover]

Summary:

In the displayModeToInt() function, there is no default case defined which is causing the following warning in React Native Windows when trying to build on the New Architecture:

##[error]node_modules\react-native\ReactCommon\react\renderer\uimanager\primitives.h(163,1): Error C2220: the following warning is treated as an error
D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\uimanager\primitives.h(163,1): error C2220: the following warning is treated as an error [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]
##[warning]node_modules\react-native\ReactCommon\react\renderer\uimanager\primitives.h(163,1): Warning C4715: 'facebook::react::displayModeToInt': not all control paths return a value
D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\uimanager\primitives.h(163,1): warning C4715: 'facebook::react::displayModeToInt': not all control paths return a value [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]

Adding the default case removes the warning and resolves the issue. Not sure if using the -1 value in this case is appropriate.

Changelog:

[General] [Fixed] - Add default case to displayModeToInt() function

Test Plan:

Tested on React Native Windows New Arch application and was able to build successfully.

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