software/theia: use more recent vscode-java-redhat

The version from theia images does not support running from a plugin
installed in a read only folder, this newest version seem to work.

Also set the required java.home setting

software/theia/software.cfg

@@ -160,6 +160,7 @@ mode = 0644
 [package.json]
 recipe = slapos.recipe.template:jinja2
 # this comes from https://github.com/theia-ide/theia-apps/blob/3391dd07cba7ddc5cc833420349a27beb66a5433/theia-full-docker/latest.package.json
+# but with a more recent version of vscode-java-redhat, where https://github.com/redhat-developer/vscode-java/issues/1301 was fixed
 template =
   inline:{
       "private": true,
@@ -186,7 +187,8 @@ template =
                       "editor.tabSize": 2,
                       "plantuml.monochrome": false,
                       "plantuml.webservice": "//plantuml.host.vifib.net/svg/",
-                      "gitlens.remotes": [{ "domain": "lab.nexedi.com", "type": "GitLab" }]
+                      "gitlens.remotes": [{ "domain": "lab.nexedi.com", "type": "GitLab" }],
+                      "java.home": "${java-jdk:location}"
                   }
               }
           }
@@ -310,7 +312,7 @@ template =
           "vscode-go": "https://github.com/microsoft/vscode-go/releases/download/0.12.0/Go-0.12.0.vsix",
           "vscode-java-debug": "https://github.com/microsoft/vscode-java-debug/releases/download/0.24.0/vscjava.vscode-java-debug-0.24.0.vsix",
           "vscode-java-dependency-viewer": "https://github.com/microsoft/vscode-java-dependency/releases/download/0.6.0/vscode-java-dependency-0.6.0.vsix",
-          "vscode-java-redhat": "https://github.com/redhat-developer/vscode-java/releases/download/v0.54.2/redhat.java-0.54.2.vsix",
+          "vscode-java-redhat": "https://github.com/redhat-developer/vscode-java/releases/download/v0.61.0/redhat.java-0.61.0.vsix",
           "vscode-java-test": "https://github.com/microsoft/vscode-java-test/releases/download/0.22.0/vscjava.vscode-java-test-0.22.0.vsix",
           "vscode-python": "https://github.com/microsoft/vscode-python/releases/download/2020.1.58038/ms-python-release.vsix",
           "vscode-ruby": "https://github.com/rubyide/vscode-ruby/releases/download/v0.25.0/ruby-0.25.0.vsix",