Some signaling improvements in KisDlgInternalColorSelector:

• actually use the signal compressor to prevent excessive updating, so emit the signals in the slot for timeout()
• slotLockSelector() was just an obfuscated m_d->allowUpdates = false; set it explicitly to make it consistent with the rest and remove this slot
• make sure currentColor is in the proper color space after lockUsedColorSpace(), otherwise our input widgets will switch right back when the dialog gets shown
• fix logic on which update calls to accept/ignore