Remove dead counting loop in GenerateAssetMappings

The first pass of _countJsonArrayElements increments depth on every
'{' or '[', so the subsequent 'else if (c == "{" && depth == 1)'
branch is unreachable and count is always 0. The second pass (with
depth tracking only for '['/']') is what actually produces the count.

Drop the dead first loop. imx_tokens.json entries are flat, so the
remaining logic correctly counts top-level array objects.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: lfportal

script/GenerateAssetMappings.s.sol

@@ -111,29 +111,6 @@ contract GenerateAssetMappings is Script {
         uint256 depth = 0;
         bool inString = false;
 
-        for (uint256 i = 0; i < jsonBytes.length; i++) {
-            bytes1 c = jsonBytes[i];
-
-            if (c == '"' && (i == 0 || jsonBytes[i - 1] != "\\")) {
-                inString = !inString;
-            }
-
-            if (!inString) {
-                if (c == "[" || c == "{") {
-                    depth++;
-                } else if (c == "]" || c == "}") {
-                    depth--;
-                } else if (c == "{" && depth == 1) {
-                    // We're at the start of a top-level object in the array
-                    count++;
-                }
-            }
-        }
-
-        // Re-count by looking for opening braces at depth 1
-        count = 0;
-        depth = 0;
-        inString = false;
         for (uint256 i = 0; i < jsonBytes.length; i++) {
             bytes1 c = jsonBytes[i];