fix: extra properties in templateFiles

[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

If t is string like 'app/template.js', the returned object will be:

{
	0: "a"
	1: "p"
	2: "p"
	3: "/"
	4: "t"
	5: "e"
	6: "m"
	7: "p"
	8: "l"
	9: "a"
	10: "t"
	11: "e"
	12: "."
	13: "j"
	14: "s",
	src: '...',
	dst: '...',
	custom: '...'
}

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.

[codecov-io]

Codecov Report

Merging #4925 into dev will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #4925      +/-   ##
==========================================
+ Coverage   91.71%   91.79%   +0.08%     
==========================================
  Files          73       73              
  Lines        2414     2414              
  Branches      594      594              
==========================================
+ Hits         2214     2216       +2     
+ Misses        182      180       -2     
  Partials       18       18

Impacted Files	Coverage Δ
packages/builder/src/builder.js	88.98% <ø> (ø)	⬆️
packages/vue-renderer/src/renderer.js	95.65% <0%> (+1.08%)	⬆️

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