Set the ljm commit hash in the correct file.

It's now in JitsiMeetJS.ts rather than .js.

webpack-shared-config.js

                         process.env.LIB_JITSI_MEET_COMMIT_HASH || 'development',
                     search: '{#COMMIT_HASH#}'
                 },
-                test: path.join(__dirname, 'JitsiMeetJS.js')
+                test: path.join(__dirname, 'JitsiMeetJS.ts')
             }, {
                 // Transpile ES2015 (aka ES6) to ES5.