Fix Xcode Archive task failing if project path contains whitespace

Summary:
Currently, Xcodebuild Archive task "Bundle React Native code and images" step fails if the project path contains whitespace characters. This is due to `react-native-xcode.sh` not escaping the local CLI path.

Ideally, of course, folks would use sane directory names, but this affects people in the community. I have seen this at a beginner hackathon, as well as Stack Overflow, e.g. https://stackoverflow.com/questions/48209829/cannot-create-offline-bundle-for-react-native-ios

```
mkdir Bad\ Name
cd Bad\ Name
react-native init TestProject
cd TestProject
open ios/TestProject.xcodeproj
```
* Run `Build > Archive`
* `cli.js bundle` command fails with "Cannot find module '.../Bad'"

* Patch `/node_modules/react-native/scripts/react-native-xcode.sh` with changed file
* Run `Build > Archive`
* Build succeeds

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  CATEGORY
[----------]        TYPE
[ CLI      ]   [-------------]      LOCATION
[ DOCS     ]   [ BREAKING    ]   [-------------]
[ GENERAL  ]   [ BUGFIX      ]   [-{Component}-]
[ INTERNAL ]   [ ENHANCEMENT ]   [ {File}      ]
[ IOS      ]   [ FEATURE     ]   [ {Directory} ]   |-----------|
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[CATEGORY] [TYPE] [LOCATION] - MESSAGE

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 [IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
 [ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
 [CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
 [DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
 [GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
 [INTERNAL] [FEATURE] [./scrip] - Added thing to script that nobody will see
-->

 [IOS] [MINOR] [scripts/react-native-xcode.sh] - Escape directory paths with spaces
Closes #17628

Differential Revision: D6806418

Pulled By: hramos

fbshipit-source-id: 7ef3943d91807d0086f0717e436e1988f9faf03d

scripts/react-native-xcode.sh

@@ -105,7 +105,7 @@ fi
 
 BUNDLE_FILE="$DEST/main.jsbundle"
 
-$NODE_BINARY $CLI_PATH $BUNDLE_COMMAND \
+$NODE_BINARY "$CLI_PATH" $BUNDLE_COMMAND \
   $CONFIG_ARG \
   --entry-file "$ENTRY_FILE" \
   --platform ios \