[client] egl: retain damage until texture is drawable

Treat a failed desktop texture bind as an incomplete render so full target
restoration remains latched until a frame can actually be drawn.

Carry retired damage into the pending record when the drawable texture does
not contain it, closing the publication gap between texture slots and their
matching damage metadata.

client/renderers/EGL/desktop.h

@@ -60,6 +60,7 @@ bool egl_desktopRender(EGL_Desktop * desktop, unsigned int outputWidth,
     LG_RendererFrameToken damageFrameToken,
     LG_RendererFrameToken frameTokenLimit, bool * fullFrame,
     LG_RendererFrameToken * consumedFrameToken,
+    LG_RendererFrameToken * renderedFrameToken,
     uint64_t * effectsTime, EGL_Framebuffer * target);
 
 void egl_desktopSpiceConfigure(EGL_Desktop * desktop, int width, int height);