Fix location reporting in block-indentation rule

[judithhinlung]

Background

This PR fixes #2906, a bug in the block-indentation rule in which the same value is reported for start and end line locations.

  {{#each cats as |dog|}}
       {{/each}}

**Before**:
             {
              "column": 8,
               "endColumn": 8,
               "endLine": 2,
               "filePath": "layout.hbs",
               "isFixable": true,
              "line": 2,
...

**After**:
                "column": 0,
               "endColumn": 8,
               "endLine": 2,
               "filePath": "layout.hbs",
               "isFixable": true,
                "line": 1,
...

### Testing
Test Suites: 148 passed, 148 total
Tests:       5 skipped, 8517 passed, 8522 total
Snapshots:   1106 passed, 1106 total
Time:        139.666 s
Ran all test suites.
✨  Done in 174.15s.