Fix CloudWatch alarm template about dimensions

[shirox]

There was an error in the template of CloudWatch alarm...

Error: Unsupported block type

  on cloudwatch_alarm.tf line 14, in resource "aws_cloudwatch_metric_alarm" "xxxxxxx":
  14:     dimensions {

Blocks of type "dimensions" are not expected here. Did you mean to define
argument "dimensions"? If so, use the equals sign to assign it a value.

[coveralls]

Coverage remained the same at 100.0% when pulling 38065b6 on shirox:fix/cwa_template_at_dimensions into 67cb929 on dtan4:master.

[coveralls]

Coverage remained the same at 100.0% when pulling a49f585 on shirox:fix/cwa_template_at_dimensions into 67cb929 on dtan4:master.