change to only open light theme to prevent green-page-error

.metals/metals.lock.db

 #FileLock
-#Tue Apr 20 12:01:31 ICT 2021
-server=localhost\:59392
+#Wed Apr 21 11:47:18 ICT 2021
+server=localhost\:54985
 hostName=localhost
 method=file
-id=178eda7a940a923fddcf46a2600cc85efa298922caf
+id=178f2c102c821db578c01cd69320af784cf46b7a7b2

.metals/metals.log

@@ -10,3 +10,7 @@
 2021.04.20 12:01:16 INFO  time: initialize in 7.36s
 2021.04.20 12:01:32 WARN  Build server is not auto-connectable.
 2021.04.20 12:01:32 WARN  no build tool detected in workspace 'D:\Installation\Grafana\fordevonly\grafana'. The most common cause for this problem is that the editor was opened in the wrong working directory, for example if you use sbt then the workspace directory should contain build.sbt. 
+2021.04.21 11:44:37 INFO  Started: Metals version 0.10.1 in workspace 'D:\Installation\Grafana\fordevonly\grafana' for client vscode 1.55.2.
+2021.04.21 11:44:44 INFO  time: initialize in 7.99s
+2021.04.21 11:47:20 WARN  Build server is not auto-connectable.
+2021.04.21 11:47:20 WARN  no build tool detected in workspace 'D:\Installation\Grafana\fordevonly\grafana'. The most common cause for this problem is that the editor was opened in the wrong working directory, for example if you use sbt then the workspace directory should contain build.sbt. 

packages/grafana-ui/src/themes/getTheme.ts

-import darkTheme from './dark';
+// import darkTheme from './dark';
 import lightTheme from './light';
 import { GrafanaTheme } from '@grafana/data';
 
 let themeMock: ((name?: string) => GrafanaTheme) | null;
 
 export const getTheme = (name?: string) =>
-  (themeMock && themeMock(name)) || (name === 'light' ? lightTheme : darkTheme);
+  (themeMock && themeMock(name)) || (name === 'light' ? lightTheme : lightTheme);
 
 export const mockTheme = (mock: (name?: string) => GrafanaTheme) => {
   themeMock = mock;