linux: fix word move/select shortcuts (#9673)

`alt+left/right` are never used on Linux.
The Linux keymap still has some other issues, but these shortcuts in
particular are really common when editing text.

Release Notes:

- N/A

assets/keymaps/default-linux.json

@@ -75,9 +75,9 @@
       "ctrl-b": "editor::MoveLeft",
       "ctrl-f": "editor::MoveRight",
       "ctrl-shift-l": "editor::NextScreen", // todo(linux): What is this
-      "alt-left": "editor::MoveToPreviousWordStart",
+      "ctrl-left": "editor::MoveToPreviousWordStart",
       "alt-b": "editor::MoveToPreviousWordStart",
-      "alt-right": "editor::MoveToNextWordEnd",
+      "ctrl-right": "editor::MoveToNextWordEnd",
       "alt-f": "editor::MoveToNextWordEnd",
       "ctrl-e": "editor::MoveToEndOfLine",
       "ctrl-home": "editor::MoveToBeginning",
@@ -89,9 +89,9 @@
       "ctrl-shift-b": "editor::SelectLeft",
       "shift-right": "editor::SelectRight",
       "ctrl-shift-f": "editor::SelectRight",
-      "alt-shift-left": "editor::SelectToPreviousWordStart",
+      "ctrl-shift-left": "editor::SelectToPreviousWordStart",
       "alt-shift-b": "editor::SelectToPreviousWordStart",
-      "alt-shift-right": "editor::SelectToNextWordEnd",
+      "ctrl-shift-right": "editor::SelectToNextWordEnd",
       "alt-shift-f": "editor::SelectToNextWordEnd",
       "ctrl-shift-up": "editor::SelectToStartOfParagraph",
       "ctrl-shift-down": "editor::SelectToEndOfParagraph",