Fix build_and_test.yml (#195)

Summary:
Turns out you can't have multiple `name`s and `step`s.

Pull Request resolved: #195

Test Plan: https://github.com/facebookincubator/ktfmt/pull/195/checks?check_run_id=2170226133

Reviewed By: hick209

Differential Revision: D27244636

Pulled By: cgrushko

fbshipit-source-id: db336ea4a90ebcc7d7c54c196d5bd15bd196e5b0

.github/workflows/build_and_test.yml

@@ -24,11 +24,9 @@ jobs:
  uses: actions/setup-java@v1
  with:
  java-version: ${{ matrix.java }}
- - name: Build with Maven
+ - name: Build ktfmt
  run: mvn -B install --file pom.xml
- name: Build IntelliJ plugin on Java ${{ matrix.java }}
- steps:
- - name: Build
+ - name: Build ktfmt_idea_plugin
  run: |
  pushd ktfmt_idea_plugin
  ./gradlew build