Fix regex for key-value-pair

First group was a greedy match for the key, followed by a greedy match
for the whitespace up to the '='. This caused the white space to become
a suffix of the key... Solved by making it a non-greedy match.

src/string_utils.cpp

@@ -93,7 +93,7 @@ map<string, string> sc::parse_ini_file(const string& path, bool ignore_sections)
                 prefix = string{m[1]} + '.';
             }
         }
-        regex key_value_pat {R"(^\s*(.*)\s*=\s*("?)(.*)\2)"};
+        regex key_value_pat {R"(^\s*(.*?)\s*=\s*("?)(.*)\2)"};
         smatch match;
         if (regex_search(line, match, key_value_pat)) {
             result[prefix + string{match[1]}] = match[3];