ToolsCore_GetVmusrLimit(): use app name from ToolsServiceState struct

ToolsCore_GetVmusrLimit(): use app name from ToolsServiceState struct

The vmusr process on Windows is calling ToolsCore_GetVmusrLimit() early
in the process before ToolsCore_Setup() is called to initialize the
ctx member.  In ToolsCore_GetVmusrLimit(), changing the call to
VMTools_ConfigGetInteger to use "state->name" instead of the
state->ctx.name.