Fix misleading "curl init failed" error messages in WiFi EndPoint JSON-RPC calls

[Copilot]

The else branches following getJsonRPCData() calls in refreshCache() logged "curl init failed", which is inaccurate — those branches fire on any empty response, not just curl initialization failures.

Changes

• Device_WiFi_EndPoint.cpp: Replaced all three instances of "curl init failed" with "JSON-RPC call failed or returned empty response" in the else branches that handle empty getJsonRPCData() return values.

// Before
RDK_LOG(RDK_LOG_ERROR, LOG_TR69HOSTIF, "%s: curl init failed\n", __FUNCTION__);

// After
RDK_LOG(RDK_LOG_ERROR, LOG_TR69HOSTIF, "%s: JSON-RPC call failed or returned empty response\n", __FUNCTION__);

Affected call sites: GetWiFiSignalStrength, GetConnectedSSID, and the preceding RPC call in refreshCache().

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