Disable jsdoor separate target and build in sbbs3 target

JSDoor only compiles one file that isn't shared with the sbbs3
target, so there's no need to build them all twice.

.gitlab-ci-unix.yml

@@ -333,6 +333,7 @@ spec:
     - touch umonitor/xpdev-mt
     - touch umonitor/smblib
     - gmake $[[ inputs.build_flags ]] $BUILD_ARGS GIT=NO all
+    - gmake $[[ inputs.build_flags ]] $BUILD_ARGS jsdoor
   artifacts:
     name: "sbbs-$[[ inputs.os ]]-$[[ inputs.platform ]]"
     paths:
@@ -408,7 +409,7 @@ spec:
     - job: "$[[ inputs.os ]]-$[[ inputs.platform ]] [ciolib]"
     - job: "$[[ inputs.os ]]-$[[ inputs.platform ]] [xpdev]"
 
-"$[[ inputs.os ]]-$[[ inputs.platform ]] [jsdoor]":
+".$[[ inputs.os ]]-$[[ inputs.platform ]] [jsdoor]":
   extends:
     - .$[[ inputs.os ]]-build
   script: