Ensure frame counter has sane values even if Present() isn't called

* This means when someone has no swapchain and is doing off-screen
  rendering, the frame number won't just stick at 0, but it will at
  least be 1 for the first capture, 2 for the second, etc.

renderdoc/driver/d3d11/d3d11_device.cpp

@@ -2512,7 +2512,9 @@ void WrappedID3D11Device::StartFrameCapture(void *dev, void *wnd)
 	m_Failures = 0;
 	m_FailedFrame = 0;
 	m_FailedReason = CaptureSucceeded;
-
+	
+	m_FrameCounter = RDCMAX(1+(uint32_t)m_CapturedFrames.size(), m_FrameCounter);
+	
 	FetchFrameInfo frame;
 	frame.frameNumber = m_FrameCounter+1;
 	frame.captureTime = Timing::GetUnixTimestamp();

renderdoc/driver/gl/gl_driver.cpp

@@ -2349,7 +2349,9 @@ void WrappedOpenGL::StartFrameCapture(void *dev, void *wnd)
 	GLWindowingData prevctx = m_ActiveContexts[Threading::GetCurrentID()];
 	GLWindowingData switchctx = prevctx;
 	MakeValidContextCurrent(switchctx, wnd);
-
+	
+	m_FrameCounter = RDCMAX(1+(uint32_t)m_CapturedFrames.size(), m_FrameCounter);
+	
 	FetchFrameInfo frame;
 	frame.frameNumber = m_FrameCounter+1;
 	frame.captureTime = Timing::GetUnixTimestamp();

renderdoc/driver/vulkan/vk_core.cpp

@@ -863,6 +863,8 @@ void WrappedVulkan::StartFrameCapture(void *dev, void *wnd)
 	RenderDoc::Inst().SetCurrentDriver(RDC_Vulkan);
 
 	m_AppControlledCapture = true;
+
+	m_FrameCounter = RDCMAX(1+(uint32_t)m_CapturedFrames.size(), m_FrameCounter);
 	
 	FetchFrameInfo frame;
 	frame.frameNumber = m_FrameCounter+1;