[style](trx-rs): fix clippy warnings for -D warnings CI

The CI lint job runs clippy with -D warnings, which surfaced a set of
existing warnings across decoders, the client, and the soapysdr backend.
Resolve them so the workspace is clean under the enforced lint level:

- collapsible_match / identity_op / needless_range_loop / same_item_push
  in trx-rds, trx-wspr, trx-vdes, trx-wefax, trx-aprs (mostly tests)
- field_reassign_with_default -> struct-update syntax in trx-client config
  tests
- assign_op_pattern, useless vec!, and test-module ordering picked up by
  cargo clippy --fix in trx-client and the soapysdr WFM tests

No behaviour changes; all affected crates' tests pass.

Assisted-By: Claude Code (claude-opus-4)
Claude-Session: https://claude.ai/code/session_01NFpGtGTWUEYXLwZeZs2RAV
Signed-off-by: Stan Grams <sjg@haxx.space>

src/decoders/trx-aprs/src/lib.rs

@@ -638,7 +638,7 @@ mod tests {
         for (i, &ch) in b"N0CALL".iter().enumerate() {
             addr[i] = ch << 1;
         }
-        addr[6] = (0 << 1) | 1; // SSID=0, last=true
+        addr[6] = 1; // SSID=0, last=true
 
         let decoded = decode_ax25_address(&addr, 0);
         assert_eq!(decoded.call, "N0CALL");
@@ -652,7 +652,7 @@ mod tests {
         for (i, &ch) in b"SP2SJG".iter().enumerate() {
             addr[i] = ch << 1;
         }
-        addr[6] = (5 << 1) | 0; // SSID=5, last=false
+        addr[6] = 5 << 1; // SSID=5, last=false
 
         let decoded = decode_ax25_address(&addr, 0);
         assert_eq!(decoded.call, "SP2SJG");
@@ -667,7 +667,7 @@ mod tests {
         for (i, &ch) in b"W1AW  ".iter().enumerate() {
             addr[i] = ch << 1;
         }
-        addr[6] = (0 << 1) | 1;
+        addr[6] = 1;
 
         let decoded = decode_ax25_address(&addr, 0);
         assert_eq!(decoded.call, "W1AW");
@@ -691,8 +691,8 @@ mod tests {
         for &ch in src_bytes.as_bytes().iter().take(6) {
             frame.push(ch << 1);
         }
-        frame.push((0 << 1) | 1); // SSID=0, last=true
-                                  // Control + PID
+        frame.push(1); // SSID=0, last=true
+                       // Control + PID
         frame.push(0x03); // UI frame
         frame.push(0xF0); // No layer-3 protocol
                           // Info field