Remapped 'Run selected text in REPL' to avoid conficts, #CLJ-203

By default, "Run selected text in REPL" (Ctrl+Shift+J) conflicts with Editor->"Join Lines".
I suggest to move it to Ctrl+Shift+K, this shortcut is not occupied and is close to other Clojure REPL shortcutrs (which are Ctrl+Shift+{L,H,G})