Rename text-selection to text-select (#1131)

This should have been called `text-select`, consistent with `box-select`…

icons/text-select.json

@@ -2,10 +2,14 @@
   "$schema": "../icon.schema.json",
   "tags": [
     "find",
-    "search"
+    "search",
+    "selection"
   ],
   "categories": [
     "text",
     "cursors"
+  ],
+  "aliases": [
+    "text-selection"
   ]
-}
+}