fix path to core pack

Author: Dan Skinner

dockerfiles/Dockerfile.browser

@@ -36,15 +36,15 @@ RUN npm install --no-package-lock --no-save \
 
 WORKDIR /app/test/browser/features/fixtures/plugin_angular/angular_12
 RUN npm install --no-package-lock --no-save \
-  ../../../../bugsnag-core-*.tgz \
+  ../../../../../../bugsnag-core-*.tgz \
   ../../../../../../bugsnag-plugin-angular-*.tgz  \
   ../../../../../../bugsnag-node-*.tgz \
   ../../../../../../bugsnag-browser-*.tgz \
   ../../../../../../bugsnag-js-*.tgz
 
 WORKDIR /app/test/browser/features/fixtures/plugin_angular/angular_17
 RUN npm install --no-package-lock --no-save \
-  ../../../../bugsnag-core-*.tgz \
+  ../../../../../../bugsnag-core-*.tgz \
   ../../../../../../bugsnag-plugin-angular-*.tgz  \
   ../../../../../../bugsnag-node-*.tgz \
   ../../../../../../bugsnag-browser-*.tgz \