runmodes: minor format string fixes

runmodes: minor format string fixes

cppcheck:

src/util-runmodes.c:210:9: warning: %u in format string (no. 2) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(tname, sizeof(tname), "%s#%02u", thread_name_workers, thread+1);
        ^
src/util-runmodes.c:211:9: warning: %u in format string (no. 1) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(qname, sizeof(qname), "pickup%u", thread+1);
        ^
src/util-runmodes.c:455:9: warning: %u in format string (no. 2) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(tname, sizeof(tname), "%s#%02u", thread_name_workers, thread+1);
        ^
src/util-runmodes.c:457:9: warning: %u in format string (no. 1) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(qname, sizeof(qname), "pickup%u", thread+1);
        ^

src/runmode-erf-file.c:188:9: warning: %u in format string (no. 2) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(tname, sizeof(tname), "%s#%02u", thread_name_workers, thread+1);
        ^
src/runmode-erf-file.c:189:9: warning: %u in format string (no. 1) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(qname, sizeof(qname), "pickup%u", thread+1);
        ^
src/runmode-pcap-file.c:201:9: warning: %u in format string (no. 2) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(tname, sizeof(tname), "%s#%02u", thread_name_workers, thread+1);
        ^
src/runmode-pcap-file.c:202:9: warning: %u in format string (no. 1) requires 'unsigned int' but the argument type is 'signed int'. [invalidPrintfArgType_uint]
        snprintf(qname, sizeof(qname), "pickup%u", thread+1);
        ^

Bug: #5291.