SDA-1062: warn users before closing running app (#972)

- On macOS, currently, when trying to install new version of SDA, we simply kill the app before asking user if they'd like to quit and proceed.
- This fixes the issue and provides a better user experience.

Signed-off-by: Vishwas Shashidhar <vishwas.shashidhar@symphony.com>

installer/mac/preinstall.sh

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-# Kill the existing running instance
-sudo killall Symphony
-
 delete_app()
 {
     # Delete the installed version only if it is older than the installing version

installer/mac/symphony-mac-packager.pkgproj

@@ -9,7 +9,7 @@
 			<array>
 				<dict>
 					<key>APPLICATION_ID</key>
-					<string>com.symphony.symphony-desktop</string>
+					<string>com.symphony.electron-desktop</string>
 					<key>STATE</key>
 					<true/>
 				</dict>