Remove double click action on cell

This feature was a source of confusion for new pgweb users for quite
some time now. Most people thought by double-clicking the cell it
would allow them to edit the value since the column is replaced
with textarea. The textarea was there to copy the cell's value, not
for editing. Feature is no longer required due to availability of a
cell context menu, which provides a link to copy the value.

static/css/app.css

@@ -538,12 +538,6 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: pre;
-
-  /*
-  -webkit-user-select: none;
-  -moz-user-select: none;
-  -ms-user-select: none;
-  */
 }
 
 #results td div span.null {

static/js/app.js

@@ -1189,26 +1189,6 @@ $(document).ready(function() {
     showTableContent(sortColumn, sortOrder);
   });
 
-  $("#results").on("dblclick", "td > div", function() {
-    if ($(this).has("textarea").length > 0) {
-      return;
-    }
-
-    var value = unescapeHtml($(this).html());
-    if (!value) { return; }
-
-    var textarea = $("<textarea />").
-      text(value).
-      addClass("form-control").
-      css("width", $(this).css("width"));
-
-    if (value.split("\n").length >= 3) {
-      textarea.css("height", "200px");
-    }
-
-    $(this).html(textarea).css("max-height", "200px");
-  });
-
   $("#refresh_tables").on("click", function() {
     loadSchemas();
   });