Revert "Remove hardcoded R path settings from devcontainer.json for dynamic R version selection"

This reverts commit c9ba137.

Author: avinab-neogy

.devcontainer/devcontainer.json

@@ -12,6 +12,8 @@
                 "editor.detectIndentation": false,
                 "r.lsp.diagnostics": false,
                 "r.plot.useHttpgd": true,
+                "r.rpath.linux": "/usr/bin/R",
+                "r.rterm.linux": "/usr/bin/R",
                 "terminal.integrated.sendKeybindingsToShell": true,
                 "svn.multipleFolders.enabled": true,
                 "workbench.editorAssociations": {