Fix build "terser minification error"

[nooitaf]

Dynamic imports in router.js seem to confuse the build phase..
Related issue: #1

This builds fine now.

Before:

$ meteor build ../docker/builds/
⚡️ Building packages to make them available to export analyzer...
⚡️ Packages built (11549.98ms)
⚡️ Building with Vite...
vite v3.2.5 building for production...
transforming...
✓ 33 modules transformed.
rendering chunks...
node_modules/.vite-meteor/dist/meteor-entry.js   0.02 KiB / gzip: 0.04 KiB
node_modules/.vite-meteor/dist/About.js          0.59 KiB / gzip: 0.33 KiB
node_modules/.vite-meteor/dist/main.js           285.62 KiB / gzip: 67.41 KiB

⚡️ Build successful (917.73ms)
Errors prevented bundling:                    
While minifying app code:                     
packages/minifyStdJS/plugin/minify-js.js:49:25: terser minification error (SyntaxError:"Import" statement may only appear at the top level)
Source file: client/main.js  (2:0)
Line content: import "./vite/meteor-entry.js"

at maybeThrowMinifyErrorBySourceFile (packages/minifyStdJS/plugin/minify-js.js:49:25)
at packages/minifyStdJS/plugin/minify-js.js:77:11
at Array.forEach (<anonymous>)
at MeteorMinifier.processFilesForBundle (packages/minifyStdJS/plugin/minify-js.js:66:11)


While minifying app code:
packages/minifyStdJS/plugin/minify-js.js:49:25: terser minification error (SyntaxError:"Import" statement may only appear at the top level)
Source file: client/main.js  (2:0)
Line content: import "./vite/meteor-entry.js"

at maybeThrowMinifyErrorBySourceFile (packages/minifyStdJS/plugin/minify-js.js:49:25)
at packages/minifyStdJS/plugin/minify-js.js:77:11
at Array.forEach (<anonymous>)
at MeteorMinifier.processFilesForBundle (packages/minifyStdJS/plugin/minify-js.js:66:11)

After:

$ meteor build ../docker/builds/
⚡️ Building packages to make them available to export analyzer...
⚡️ Packages built (4963.63ms)
⚡️ Building with Vite...
vite v3.2.5 building for production...
transforming...
✓ 33 modules transformed.
rendering chunks...
node_modules/.vite-meteor/dist/meteor-entry.js   295.17 KiB / gzip: 69.45 KiB

⚡️ Build successful (911.32ms)