Fix syntax

.github/workflows/maven.yml

@@ -49,10 +49,10 @@ jobs:
     # SonarQube scan does not work for forked repositories
     # See https://jira.sonarsource.com/browse/MMF-1371
     - name: Build with Maven
-      if: "github.ref != ‘refs/heads/master’"
+      if: github.ref != 'refs/heads/master'
       run: xvfb-run mvn clean verify
     - name: Build with Maven and run SonarQube analysis
-      if: "github.ref == ‘refs/heads/master’"
+      if: github.ref == 'refs/heads/master'
       run: xvfb-run mvn clean verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar
       env:
         # These two env variables are needed for sonar analysis