src/goDebugConfiguration: fix debugAdapter default selection

The intention of cl/399077 is to choose 'legacy' as the default
for 'remote' mode when we are not in preview mode, while choose
'dlv-dap' when we are in preview mode. The condition was reversed.
CI couldn't detect the bug because it was running only in
preview mode.

For #2168
Fixes #2215

Change-Id: I31b353abce29e52270cc589916c61aa5712258e3
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/402220
Reviewed-by: Polina Sokolova <[email protected]>

Author: hyangah

src/goDebugConfiguration.ts

@@ -172,7 +172,7 @@ export class GoDebugConfigurationProvider implements vscode.DebugConfigurationPr
 		// from package.json (dlv-dap) unless this is remote attach with a stable release.
 		if (!debugConfiguration['debugAdapter']) {
 			debugConfiguration['debugAdapter'] = defaultConfig.debugAdapter.default;
-			if (debugConfiguration['mode'] !== 'remote' && !extensionInfo.isPreview) {
+			if (debugConfiguration['mode'] === 'remote' && !extensionInfo.isPreview) {
 				debugConfiguration['debugAdapter'] = 'legacy';
 			}
 		}