fix(renderer): correctly load nomodule scripts in safari 10

[clarkdo]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Fix #6032

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[clarkdo]

@manniL In safari 10, nomodule should not be loaded.

[codecov-io]

Codecov Report

Merging #6033 into dev will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #6033      +/-   ##
==========================================
- Coverage   95.69%   95.69%   -0.01%     
==========================================
  Files          82       82              
  Lines        2693     2692       -1     
  Branches      692      692              
==========================================
- Hits         2577     2576       -1     
  Misses         98       98              
  Partials       18       18

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.18% <50%> (-0.1%)	⬇️
#unit	92.79% <66.66%> (+0.1%)	⬆️

Impacted Files	Coverage Δ
packages/vue-renderer/src/renderers/modern.js	98.36% <100%> (+0.05%)	⬆️
packages/webpack/src/plugins/vue/modern.js	86.11% <100%> (-1.39%)	⬇️
packages/utils/src/modern.js	100% <100%> (ø)	⬆️

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