Closes #3826: SD printing will now pause and stop the print counter

The LCD menu items for SD printing pause/stop have been updated to control
also the print job timer. This commit also fixes a small output bug with
M78, the failed print counter was displaying the wrong value.

Marlin/printcounter.cpp

@@ -86,7 +86,7 @@ void PrintCounter::showStats() {
 
   SERIAL_ECHOPGM(", Failed: ");
   SERIAL_ECHO(this->data.totalPrints - this->data.finishedPrints
-    - (this->isRunning() || this->isPaused()) ? 1 : 0); // Removes 1 from failures with an active counter
+    - ((this->isRunning() || this->isPaused()) ? 1 : 0)); // Removes 1 from failures with an active counter
 
   uint32_t t = this->data.printTime /60;
   SERIAL_ECHOPGM(", Total print time: ");