Fix build qualifier suffix.

Author: tcornerstone

pom.xml

@@ -25,7 +25,7 @@
     <!--
     <tycho-snapshots>https://repo.eclipse.org/content/repositories/tycho-snapshots/</tycho-snapshots>
      -->
-    <unofficialSuffix>-UNOFFICIAL</unofficialSuffix>
+    <unofficialSuffix>'-UNOFFICIAL'</unofficialSuffix>
   </properties>
 
   <pluginRepositories>
@@ -329,7 +329,7 @@
               <timestampProvider>jgit</timestampProvider>
               <jgit.ignore>pom.xml .gitignore .launchers/**</jgit.ignore>
               <jgit.dirtyWorkingTree>warning</jgit.dirtyWorkingTree>
-              <format>yyyyMMddHHmm'${unofficialSuffix}'</format>
+              <format>yyyyMMddHHmm${unofficialSuffix}</format>
             </configuration>
           </plugin>
         </plugins>