fix(template): remove blank lines in scss/map-deep and scss/map-flat templates

[kseino]

Issue #, if available: #418

Description of changes: Setting "showFileHeader": false generates two blank lines in scss/map-deep and scss/map-flat files. scss/variables does not generate blank lines. This PR should remove two blank lines.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Reproduction:
config.json

{
  "source": ["properties/**/*.json"],
  "platforms": {
    "scss:variables": {
      "transformGroup": "scss",
      "buildPath": "build/scss/",
      "files": [
        {
          "destination": "variables.scss",
          "format": "scss/variables",
          "options": { "showFileHeader": false }
        }
      ]
    },
    "scss:map-deep": {
      "transformGroup": "scss",
      "buildPath": "build/scss/",
      "files": [
        {
          "destination": "mapdeep.scss",
          "format": "scss/map-deep",
          "options": { "showFileHeader": false }
        }
      ]
    },
    "scss:map-flat": {
      "transformGroup": "scss",
      "buildPath": "build/scss/",
      "files": [
        {
          "destination": "mapflat.scss",
          "format": "scss/map-flat",
          "options": { "showFileHeader": false }
        }
      ]
    }
  }
}

[chazzmoney]

Thank you for your contribution!