Debugger: revert behaviour from 8fce7a8 so that Ctrl+F2 doesn't immediately stop the drive spinning, but F2 still does (#460)

source/Disk.cpp

@@ -828,7 +828,7 @@ void DiskReset(const bool bIsPowerCycle/*=false*/)
 	floppywritemode = 0;
 	phases = 0;
 
-	if (bIsPowerCycle)	// GH#460 - Ctrl+Reset whilst debugging acts like a power-cycle
+	if (bIsPowerCycle)	// GH#460
 	{
 		g_aFloppyDisk[DRIVE_1].spinning   = 0;
 		g_aFloppyDisk[DRIVE_1].writelight = 0;

source/Frame.cpp

@@ -2033,13 +2033,21 @@ void RelayEvent (UINT message, WPARAM wparam, LPARAM lparam) {
 
 //===========================================================================
 
+// CtrlReset() vs ResetMachineState():
+// . CPU: 
+//		Ctrl+Reset : sp=-3 / CpuReset()
+//		Power cycle: sp=0x1ff / CpuInitialize()
+// . Disk][:
+//		Ctrl+Reset : if motor-on, then motor-off but continue to spin for 1s
+//		Power cycle: motor-off & immediately stop spinning
+
 // todo: consolidate CtrlReset() and ResetMachineState()
 void ResetMachineState ()
 {
-  DiskReset(true);	// Set floppymotoron=0
+  DiskReset(true);
   g_bFullSpeed = 0;	// Might've hit reset in middle of InternalCpuExecute() - so beep may get (partially) muted
 
-  MemReset();
+  MemReset();	// calls CpuInitialize()
   PravetsReset();
   DiskBoot();
   VideoResetState();
@@ -2069,7 +2077,7 @@ void CtrlReset()
 		MemResetPaging();
 
 	PravetsReset();
-	DiskReset(g_nAppMode == MODE_DEBUG);	// For MODE_DEBUG act like a power-cycle (GH#460)
+	DiskReset();
 	KeybReset();
 	if (!IS_APPLE2)			// TODO: Why not for A][ & A][+ too?
 		VideoResetState();	// Switch Alternate char set off