Added feature to press enter on keyboard when logging in

...main/java/com/application/GUI/LineChartFunctionality.java

...ain/java/com/application/GUI/PopUpWindows/InputPopup.java

...ain/java/com/application/GUI/PopUpWindows/LoginPopup.java

target/classes/com/application/DB/AccountHandler.class

target/classes/com/application/DB/DB.class

target/classes/com/application/DB/HelpingFunctions.class

.../classes/com/application/GUI/LineChartFunctionality.class

target/classes/com/application/GUI/Panes/BottomBar.class

target/classes/com/application/GUI/Panes/LogoBar.class

target/classes/com/application/GUI/Panes/MenuBar.class

...ses/com/application/GUI/Panes/SideBar$1WorkerThread.class

target/classes/com/application/GUI/Panes/SideBar.class

...classes/com/application/GUI/PopUpWindows/InputPopup.class

...classes/com/application/GUI/PopUpWindows/LoginPopup.class

target/classes/com/application/Main.class