moved block to source gdbinit

when the linux distro is not supported or is arch based, the setup.sh exits after giving install instructions and before sourcing the gdbinit. by moving this block to before any ``exit 1``'s are called, making it so that the source line is always there no matter what.

setup.sh

@@ -10,6 +10,11 @@ if ! hash sudo 2>/dev/null && whoami | grep root; then
     }
 fi
 
+# Load Pwndbg into GDB on every launch.
+if ! grep pwndbg ~/.gdbinit &>/dev/null; then
+    echo "source $PWD/gdbinit.py" >> ~/.gdbinit
+fi
+
 # Helper functions
 linux() {
     uname | grep -i Linux &>/dev/null
@@ -159,8 +164,3 @@ ${PYTHON} -m pip install ${INSTALLFLAGS} --upgrade pip
 
 # Install Python dependencies
 ${PYTHON} -m pip install ${INSTALLFLAGS} -Ur requirements.txt
-
-# Load Pwndbg into GDB on every launch.
-if ! grep pwndbg ~/.gdbinit &>/dev/null; then
-    echo "source $PWD/gdbinit.py" >> ~/.gdbinit
-fi