refactor: streamline upgrade script and update Flutter environment variable

.bashrc

@@ -81,11 +81,8 @@ if [ -d "/home/menno/Projects/Work" ]; then
     export TRADAWARE_DEVOPS=true
 fi
 
-# Flutter Environment
-if [ -d "$HOME/flutter" ]; then
-    export PATH="$PATH:$HOME/flutter/bin"
-    export CHROME_EXECUTABLE=/usr/bin/brave-browser
-fi
+# Flutter Web and other tools that require Chrome
+export CHROME_EXECUTABLE=$(which brave)
 
 # 1Password Source Plugin (Assuming bash compatibility)
 if [ -f /home/menno/.config/op/plugins.sh ]; then