[BUGFIX] fix whitespaces

gulp/inline-svg-template.mustache

 @function str-replace($string, $search, $replace: '') {
-  $index: str-index($string, $search);
+	$index: str-index($string, $search);
 
-  @if $index {
-    @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
-  }
+	@if $index {
+		@return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
+	}
 
-  @return $string;
+	@return $string;
 }
 
 {{#svgs}}