Fix lingering KTXwriterScParams metadata from encode/transcode inputs (#852)

Fixes #851.

Author: aqnuep

tests/cts

@@ -211,6 +211,7 @@ void CommandEncode::executeEncode() {
 
     // Add KTXwriterScParams metadata
     const auto writerScParams = fmt::format("{}{}", options.codecOptions, options.compressOptions);
+    ktxHashList_DeleteKVPair(&texture->kvDataHead, KTX_WRITER_SCPARAMS_KEY);
     if (writerScParams.size() > 0) {
         // Options always contain a leading space
         assert(writerScParams[0] == ' ');

tools/ktx/command_encode.cpp

@@ -173,6 +173,7 @@ void CommandTranscode::executeTranscode() {
 
     // Add KTXwriterScParams metadata if supercompression was used
     const auto writerScParams = options.compressOptions;
+    ktxHashList_DeleteKVPair(&texture->kvDataHead, KTX_WRITER_SCPARAMS_KEY);
     if (writerScParams.size() > 0) {
         // Options always contain a leading space
         assert(writerScParams[0] == ' ');