src/goTools: remove unneeded import

Change-Id: I7266d136fc5f5b95f52fc144dc0219042262ebed
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/442785
Reviewed-by: Suzy Mueller <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
TryBot-Result: kokoro <[email protected]>

Author: hyangah

src/goTools.ts

@@ -15,7 +15,6 @@ import { getFormatTool, usingCustomFormatTool } from './language/legacy/goFormat
 import { goLiveErrorsEnabled } from './language/legacy/goLiveErrors';
 import { allToolsInformation } from './goToolsInformation';
 import { getBinPath, GoVersion } from './util';
-import { toolInstallationEnvironment } from './goEnv';
 
 export interface Tool {
 	name: string;