Remove colon from the word separators

Fixes #745

src/SelectionManager.ts

@@ -42,7 +42,7 @@ const CLEAR_MOUSE_DISTANCE = 10;
  * A string containing all characters that are considered word separated by the
  * double click to select work logic.
  */
-const WORD_SEPARATORS = ' ()[]{}:\'"';
+const WORD_SEPARATORS = ' ()[]{}\'"';
 
 // TODO: Move these constants elsewhere, they belong in a buffer or buffer
 //       data/line class.