Timeout cleanup

src/TinyGsmClientA6.h

@@ -689,8 +689,7 @@ public:
     streamWrite(tail...);
   }
 
-  bool streamSkipUntil(char c) {
-    const unsigned long timeout = 1000L;
+  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
     unsigned long startMillis = millis();
     while (millis() - startMillis < timeout) {
       while (millis() - startMillis < timeout && !stream.available()) {

src/TinyGsmClientBG96.h

@@ -698,8 +698,7 @@ public:
     streamWrite(tail...);
   }
 
-  bool streamSkipUntil(char c) {
-    const unsigned long timeout = 1000L;
+  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
     unsigned long startMillis = millis();
     while (millis() - startMillis < timeout) {
       while (millis() - startMillis < timeout && !stream.available()) {

src/TinyGsmClientESP8266.h

@@ -477,8 +477,7 @@ public:
     streamWrite(tail...);
   }
 
-  bool streamSkipUntil(char c) {
-    const unsigned long timeout = 1000L;
+  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
     unsigned long startMillis = millis();
     while (millis() - startMillis < timeout) {
       while (millis() - startMillis < timeout && !stream.available()) {

src/TinyGsmClientM590.h

@@ -635,8 +635,7 @@ public:
     streamWrite(tail...);
   }
 
-  bool streamSkipUntil(char c) {
-    const unsigned long timeout = 1000L;
+  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
     unsigned long startMillis = millis();
     while (millis() - startMillis < timeout) {
       while (millis() - startMillis < timeout && !stream.available()) {

src/TinyGsmClientUBLOX.h

@@ -697,8 +697,7 @@ public:
     streamWrite(tail...);
   }
 
-  bool streamSkipUntil(char c) {
-    const unsigned long timeout = 1000L;
+  bool streamSkipUntil(char c, const unsigned long timeout = 1000L) {
     unsigned long startMillis = millis();
     while (millis() - startMillis < timeout) {
       while (millis() - startMillis < timeout && !stream.available()) {