Support eval in watch mode

Author: Mrtenz

packages/snaps-cli/src/webpack/__snapshots__/config.test.ts.snap

@@ -2183,7 +2183,7 @@ exports[`getDefaultConfiguration returns the default Webpack configuration for t
   "plugins": [
     SnapsWebpackPlugin {
       "options": {
-        "eval": false,
+        "eval": true,
         "manifestPath": "/bar/snap.manifest.json",
         "writeManifest": true,
       },
@@ -2889,7 +2889,7 @@ exports[`getDefaultConfiguration returns the default Webpack configuration for t
   "plugins": [
     SnapsWebpackPlugin {
       "options": {
-        "eval": false,
+        "eval": true,
         "manifestPath": "/bar/snap.manifest.json",
         "writeManifest": true,
       },

packages/snaps-cli/src/webpack/config.ts

@@ -307,7 +307,7 @@ export async function getDefaultConfiguration(
       new SnapsWebpackPlugin({
         manifestPath: config.manifest.path,
         writeManifest: config.manifest.update,
-        eval: !options.watch && options.evaluate,
+        eval: options.evaluate,
       }),
 
       /**