Add $ back for osgi header

Author: deannagarcia

java/core/pom_template.xml

@@ -31,7 +31,7 @@
             <Automatic-Module-Name>com.google.protobuf</Automatic-Module-Name> <!-- Java9+ Jigsaw module name -->
             <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
             <Bundle-SymbolicName>com.google.protobuf</Bundle-SymbolicName>
-            <Export-Package>com.google.protobuf;version={project.version}</Export-Package>
+            <Export-Package>com.google.protobuf;version=${project.version}</Export-Package>
             <Import-Package>sun.misc;resolution:=optional,*</Import-Package>
           </instructions>
         </configuration>

java/lite/pom_template.xml

@@ -31,7 +31,7 @@
             <Automatic-Module-Name>com.google.protobuf</Automatic-Module-Name> <!-- Java9+ Jigsaw module name -->
             <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
             <Bundle-SymbolicName>com.google.protobuf</Bundle-SymbolicName>
-            <Export-Package>com.google.protobuf;version={project.version}</Export-Package>
+            <Export-Package>com.google.protobuf;version=${project.version}</Export-Package>
             <Import-Package>sun.misc;resolution:=optional,*</Import-Package>
           </instructions>
         </configuration>

java/util/pom_template.xml

@@ -32,7 +32,7 @@
             <Automatic-Module-Name>com.google.protobuf.util</Automatic-Module-Name> <!-- Java9+ Jigsaw module name -->
             <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
             <Bundle-SymbolicName>com.google.protobuf.util</Bundle-SymbolicName>
-            <Export-Package>com.google.protobuf.util;version={project.version}</Export-Package>
+            <Export-Package>com.google.protobuf.util;version=${project.version}</Export-Package>
           </instructions>
         </configuration>
       </plugin>