fix(build): disable devtool to prevent source map conflict

@nextcloud/webpack-vue-config 6.0.1 → 6.3.2 (bumped in 8ea7ae2)
sets devtool: 'source-map', which conflicts with the explicit
SourceMapDevToolPlugin. webpack 5 treats duplicate asset output
as an error, breaking the build.

Signed-off-by: Kai Henseler <kai.henseler@strato.de>

Author: bromiesTM

webpack.js

@@ -49,6 +49,8 @@ webpackConfig.module.rules.push({
 	type: 'asset/source',
 })
 
+webpackConfig.devtool = false
+
 webpackConfig.plugins.push(new webpack.SourceMapDevToolPlugin({
 	filename: '[file].map',
 }))