fix systeminformation not displaying electron version (#4012)

Bug was introduced with #4002

Because the sysinfo process runs as own subprocess the
`${process.versions.electron}` variable is always `undefined`.

Author: khassel

js/app.js

@@ -26,7 +26,7 @@ global.mmTestMode = process.env.mmTestMode === "true";
 Log.log(`Starting MagicMirror: v${global.version}`);
 
 // Log system information.
-Spawn("node ./js/systeminformation.js", { cwd: this.root_path, shell: true, detached: true, stdio: "inherit" });
+Spawn("node ./js/systeminformation.js", { env: { ...process.env, ELECTRON_VERSION: `${process.versions.electron}` }, cwd: this.root_path, shell: true, detached: true, stdio: "inherit" });
 
 if (process.env.MM_CONFIG_FILE) {
 	global.configuration_file = process.env.MM_CONFIG_FILE.replace(`${global.root_path}/`, "");

js/systeminformation.js

@@ -20,7 +20,7 @@ const logSystemInformation = async () => {
 			"\n####  System Information  ####",
 			`- SYSTEM:   manufacturer: ${system.manufacturer}; model: ${system.model}; virtual: ${system.virtual}; MM: v${mmVersion}`,
 			`- OS:       platform: ${osInfo.platform}; distro: ${osInfo.distro}; release: ${osInfo.release}; arch: ${osInfo.arch}; kernel: ${versions.kernel}`,
-			`- VERSIONS: electron: ${process.versions.electron}; used node: ${usedNodeVersion}; installed node: ${installedNodeVersion}; npm: ${versions.npm}; pm2: ${versions.pm2}`,
+			`- VERSIONS: electron: ${process.env.ELECTRON_VERSION}; used node: ${usedNodeVersion}; installed node: ${installedNodeVersion}; npm: ${versions.npm}; pm2: ${versions.pm2}`,
 			`- ENV:      XDG_SESSION_TYPE: ${process.env.XDG_SESSION_TYPE}; MM_CONFIG_FILE: ${process.env.MM_CONFIG_FILE}`,
 			`            WAYLAND_DISPLAY:  ${process.env.WAYLAND_DISPLAY}; DISPLAY: ${process.env.DISPLAY}; ELECTRON_ENABLE_GPU: ${process.env.ELECTRON_ENABLE_GPU}`,
 			`- RAM:      total: ${totalRam} MB; free: ${freeRam} MB; used: ${usedRam} MB`,