fix(themeReplacements): replace string

[ch-jwoo]

issue

themeReplacements is only working when string is fully matched
Sometimes it causes inconvenience.

inconvenience case:

/** tailwind.config.js */
/** ... */
theme: {
  borderRadius: {
  lg: 'var(--radius)',
  md: 'calc(var(--radius) - 2px)',
  sm: 'calc(var(--radius) - 4px)',
  },
}

/** ... */
configViewer: {
  themeReplacements: {
    'var(--radius)': '0.2rem'
    'calc(var(--radius) - 2px)': 'calc(0.2rem - 2px)' // inconvenience
    'calc(var(--radius) - 4px)': 'calc(0.2rem - 4px)' // inconvenience
  }
}

solve

themeReplacements will work when string matched partially.

side effect

themeReplacements can work on unintended place which string is not fully matched.