slightly improve height calculation

Width and height must be integers, and if any of them is a float, the
default value is used silently (without warning). Using the 1024px
width accidentally results the height to be an integer, but when I
changed to some other value, it did not work, and I did not understand
why.
-
Ticket: SUITEDEV-28293

src/main/index.js

@@ -19,7 +19,7 @@ const getUrl = page =>
 
 const createWindow = async () => {
   const width = 1024;
-  const height = (1080 * width) / 1920; // video resolution: 1920*1080
+  const height = Math.floor(1080 * width) / 1920; // video resolution: 1920*1080
 
   const splashWindow = new BrowserWindow({ width, height, useContentSize: true, backgroundColor: '#E3E9F0' });
   splashWindow.loadURL(getUrl('static/splash-screen.html'));